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TV manufacturers have mostly chosen to create and maintain their own ecosystems. This is actually a declining trend. LG and Samsung do but Moore's law has gotten it to a point where Android TV and, in fact Roku's platform are becoming much more prevalent on TVs, particularly some of the newer lower end devices. There's a large cost to maintaining your own HTML based platform (which is what most 3rd parties are) and t…
My TV has Roku built-in and it’s extremely frustrating. It’s super slow, it uses some surround sound virtualization (or something) for the stereo speakers with no option to turn it off despite being terrible (you can barely hear speech, but music and effects are extremely loud), the remote has shortcut buttons for things I don’t even use (google play and sling), there’s advertisements every time I turn on my tv and o…
I currently have a really nice Sony with Android TV, but I had so many problems with the built-in Android that I plugged an nVidia Shield box into it instead and all those problems went away.
The other OS's all had their own issues, but the worst part of them was, like your Roku, the slowness. Everything is massively underpowered. Nobody wants to wait for the TV to slowly load apps when they want to be watching something.
In addition, other than Android, all of them tend to lag behind on updates after the initial launch of the each app.
So now I ignore whatever is on the TV and use an external box. I've considered FireTV and Roku again, but every time I look into them, I read about problems that I don't want to have (like this article) and so I stick with nVidia Shield boxes.