With that said, our big TV is an LG (OLED), but we don’t use the SMARTer side of it (I’ve looked at it, but why?). We tune channels TV wise and use our connected Roku. Our older LCD TVs are non-smart (dumb) with attached Rokus. The new Roku Ultra can power on my LG and raise/lower volume. So about the only thing we might have to do is switch between LG OTA TV and the Roku input (talking about where the LG remote/app/voice is used).
To the SMART TV credit side, since this means they all can be controlled from my phone, and my Roku can be controlled from my phone… you could say, at least we have the whole “one remote” thing…