Clearly mycloud makes sense for you since you already own one! I on the other hand have already spent several hundred pounds on a Synology NAS and nothing is going to persuade me to spend a further £150 on a mycloud just to run Channels DVR. So if only mycloud were supported, I’d be a lost customer. I do have a Mac, however, and would be very happy to run channels DVR on it (leaving it on 24x7 is a non-issue: it can just sleep, auto-wake to record then auto-sleep again afterwards). So supporting Mac and my cloud gains me as a customer again whilst keeping you as a customer too (whether you choose to run on Mac or mycloud)
If you extend the logic out beyond just you and me to all the various makes and models of NAS, the overwhelmingly most sensible route in terms of maximising customer base is to support Mac + as many different NAS platforms as possible. Because Mac is the one single platform that ‘captures’ the maximum number of households who either have no NAS or one of the tens of NAS models that inevitably will be on the ‘unsupported’ list.
So then the only question becomes the priority order in which to support NASs in addition to Mac (which the developers have said they’ve already developed for anyway). And in answer to that, despite being a Synology owner I can see the logic of putting MyCloud at the top for the simple reason that if you’re a non-NAS, non-computer household that’s the cheapest route in plus it has good market share amongst those households with a NAS.