I went down this path with my Mom a few years ago and wrote a blog post about it.
The cable package she was coming from was very basic, less than a 100 channels and no bells and whistles. No DVR, no on screen guide, nothing like that at all. She had reached a point she couldn't have learned how to operate something much different. The Channels app itself even was too confusing because that was my first round with trying this with her. Our internet then was slower and the odd moment of buffering would cause it to fall behind and she had no clue how to proceed if channels asked her if she really wanted to change channels because what she was watching was behind real time.
For her the ideal combo turned out to be channels using their m3u as the input in the Tivimate app. Then Flirc with a regular remote control. In her case she didn't care as much about channel numbers. She mainly wanted to go up and down but I still printed her a list of what was on each channel number. Tivimate has settings to start the app up when the device powers on and will go back to the last channel playing. Apparently doesn't work on all devices but worked on the Tivo Stream 4k.
This is the remote I used with Flirc.
Two reasons I selected it - one it could learn IR Codes because I could not get Flirc to control the volume no matter what. So I just taught it the TV's actual IR for volume. The second reason was that volume and channel up/down buttons are actually labeled - without that she couldn't remember which button did what.
In the end, she liked this set up better than her old cable because there were more channels she enjoyed and the picture was better than our ancient cable system here. So it was win/win for her. Paid less and enjoyed it more.
Still I had to occasionally fix things for her. Like if she randomly got tossed to the home screen on Android (how I don't know because her remote had no button that would take her out of the app - must have crashed). So just food for thought if it's not someone near enough by you can take time out to get things working again. She could have just powered it off and on but she would panic when something unexpected happened. So that's a YMMV sort of deal.