I have a Vizio TV that was advertised as a Chromecast TV, and I got it because of that. It was HDMI and Chromecast only. A few years later they did a silent update that added apps and generally made the UI much slower. I mainly use it with an AppleTV or game consoles, but it still irks me that they completely changed what was in my mind a nearly perfect TV.

Can you factory reset it to the prior state and turn off updates?

(I know this doesn't change what Vizio did, but it might get your perfect device back)