Stop connecting your TVs directly to the internet, I don't care what OS it's running. The trend is clear with TV manufacturers, and if your current TV OS doesn't yet inject ads into your streaming box's HDMI stream, why risk it updating? Because that's coming soon enough, and I imagine what it does, an update requiring your TV to have internet connection won't be far behind.
Projectivy is great. Some bugs here and there, but overall I love the much simpler UI and that I can actually keep my "continue watching" row at the top.
Yeah a alternative launcher is the way to go, I use FL launcher but it's similar. And what I like about android on the TV is that you at least get access to the system via adb and can turn off some things like the default launcher.