If I remember correctly, webOS is now Linux-based and uses Qt5 for its primary frameworks. (Quite a change from its Palm origins.)
In fact, the open-source version of webOS just reached version 2.2.0, with the Raspberry Pi 4 as an officially supported platform. So, don't preclude webOS from the realm of possibility; but don't count on it, either.
That's a very interesting point. However I believe the CPU intensive aspect of Channels relates to software de-interlacing and decoding. Set-top boxes such as ATV, Roku and Firestick are originally intended to handle progressively encoded web video streams and support H264 +/- H265 +/- VP8/9. As such the manufacturers have chosen not to implement deinterlacers or mpeg2 decoders in the silicon either deliberately to cut cost or because the decoding of interlaced broadcast medium was never in the original specification for the device.
As such the Channels developers have to use their own software player (derived from mplayer and other OSS libraries) rather than the system player of the device. In the best case scenario mplayer has to deinterlace H264 which can then be handed off to the hardware decoder and in the worst case has to deinterlace and decode mpeg2. I'm not too sure about how the audio pipeline is handled but I suspect CPU demands are much lower than video decoding.
The raison d'etre of a TV is to decode OTA signals. They will include an ATSC or DVB tuner just like the HDHR and will have a hardware decoder that will be specifically designed to handle interlaced streams. As long as the OS allows sending interlaced streams to the decoder any smart TV should have the horsepower to display the video faultlessly as it is the exact same data stream that the TVs own tuner delivers.
All this assumes the deinterlacing is available in the API (and not done on the tuner hardware). I don't know if it is the case for any specific manufacturer.
LG Web OS or Roku wou!d be great
Search the forum and you will see that they do not plan to support Roku devices. The Roku OS has limited capabilities. I doubt web OS will be supported. I love our LG TVs but LG is the only one that uses web OS.
Another vote here for WebOS! This app is fantastic on iOS and the ability to add our own SatIP servers is just amazing.
We have no plans to write any new apps.
Hi, new user here trying this out. Just trying to wrap my head around this... my 2019 Samsung Tizen TV does not have a Fire TV Stick since it already has everything built in (voice remote, Netflix, Youtube, etc). But if I understood this correct, I need to buy a Fire TV Stick, buy HDHomerun, and pay $80/year just to add a DVR using Channels? Seems steep. I also don't want to have to fiddle with a second remote just for Fire TV, not to mention pay another $50 for that device. Anyway, just my long way of voting for support for Samsung Tizen. Thanks.
The advantage is you have a HD Home Run, and a supported NAS, attached to your router, and hidden away.
All the TVs you have with a firestick get TV wirelessly. I have a TV on the wall and I only have to worry about the power cable, and I don’t have to worry about routing areal cables around my house.
Most devices (including the Fire TV ones) support HDMI-CEC, so you can continue to use your TV's remote to navigate your third-party streaming device.
I actually chuckled reading that as someone maxed out at 15 devices on my hub remote. 
Easy to do I have a Sofabaton that can have 15 devices ... but I set it to to control devices in any room I am in. That Includes TV's FireTV Shields soundbars etc... I got tired of trying to find remotes in other rooms.
I am maxed out on my Harmony hub at 15. When I get something new, I have to delete a device. First world problems. 
Not having native Samsung & LG TV apps is missing a huge part of the market. I realize there is added expense, however 1) this represents a huge number of current & future customers and 2) having anything but a power cord and a network cable attached to a TV is rapidly becoming passé. [Needless expense, complexity, and mess (unless you are a zip tie and bracket ninja).]
[I am apparently going to have to decide in 30 days whether I really want to buy more Apple TV boxes. I (probably) do not, and I do not want to add any other new devices to my home.]
[[Edit: even having the network cable is old school; I like the stability of having video on a wire for fixed viewing locations saving bandwidth for wireless devices.]]
Maybe the higher cost smart TVs have slightly better processors and performance, but after 1-2 years most of my smart TVs' built-in apps are borderline unusable because of how slow it is. Clearly the devs have determined that trying to maintain more apps for more platforms isn't worth their time.
If you don't want to buy more Apple TVs because of the high cost, you could go with Android TV-based sticks (Chromecast w/ Google TV, TiVo Stream 4K), or Fire TV Stick 4Ks.
And maybe Channels could do a Free Chromecast/google TV with annual subscription?! That could probably be a successful campaign for new and current subscribers on the fence because of their current system?! Just a thought.
I’m sure anyone in the non US market will feel very left out of that idea, as international shipping wouldn’t be worth it.
Back to the Samsung idea app, I can completely understand why they wouldn’t, I have a Samsung smart TV, and the smart aspect hasn’t been used in years, Netflix last I checked was a sluggish pointless mess, I primarily run Amazon fire sticks now powered by the TVs own USB slots.
I don’t know how more modern smart TVs fair these days, but over the past 6 years, I’ve watched most of the smart premium features disappear from my TV including voice control, social integration and games.
If we are rehashing old threads about future platforms. I may as well join.
I upvote if LG WebOS
Upvote as well for webos
I think adding any additional platforms would be a support nightmare that would only take time away from developing good stuff that benefits everyone. Buy/borrow/steal a supported streamer.
Apparently WebOS has the same limitation as Roku and requires the use of their system video player. (At least, that's the word over at the Silicon Dust forums.) if that's genuinely the case, then it's not going to be possible.