We do?
I'm not sure that I care one way or another. Does the device work as expected? Does it do useful things? Does it do the fun things that I actually want it to do?
Then I don't care much one way or another.
On a related but possibly tangential digression, I'm showing my age, yes, but I want my TV to be a TV - a device for showing for moving pictures provided via a suitably optimized device of another ilk (I'm quite happy to accept the second function of OTA tuning, just 'coz it's pretty much always there and saves me buying another device - what with having cancelled cable about 18 months ago).
So I neither want nor need it to have an OS.
There's an AppleTV sitting below my TV. It has an OS. I don't give a damn - it works pretty darned well, thanks.
I don't know what's inside my receiver to give it Internet capabilities, and don't care - I use them very little, when my 20 year old receiver died, I bought the best value receiver that had the features I wanted: 7.1, AM, FM, CD in, Aux in.... Yeah, that was about it. AirPlay is nice, glad to have it, use it occasionally, didn't want or need it, but its presence was no deal breaker. Internet radio? Don't use it at all. DLNA? Didn't even know what it was when I bought the thing. Don't use it at all right now (don't have a media server, why would I want one? I have Netflix and AppleTV and all of our Airs can stream to AppleTV directly).
I never want to buy or receive media again, they take up space, gather dust. I'll read books when they are given to me, or when they are the best form for the content, e.g., books that are image-heavy, but otherwise Google Play Books serves me quite well, thank you.
Did I mention OS in any of that? Hmm, nope.
Don't know. Don't care.
And the OS won't prevent any of the ills that come with any of the above, e.g., DRM-enabled-yank-back, unless you the user are going to pirate to get around the DRM.
Technology cannot solve that problem, only the law and the market can, and they need us - all of us - to realize that technology is not the solution and to get out there in front of the issue and agitate for changes in the law and market.
Why sure I care which OS wins? I'm pretty sure I don't. But I am willing to entertain serious answers to a serious question. Fire away.