Smart TVs are shit. Especially the modern ones. They got worse rather than better! They are slow and laggy, even doing the most basic things like turning on or changing channel. It was faster the CRT that I used 20 years ago, and it had to warm up before displaying an image! But at least the audio started immediately... They are also not usable. The UI is crappy and you don't find the most common settings, for exampl…
I can't imagine trying to use a dumb TV now. We have four streaming services in my house, the UI homepage quickly shows which series we're in the middle of and makes it easy to jump back in without navigating a lot of menus.
Even if plex were to do exactly what I want, it's more effort on my end when I just want to be able to easily pull up shows without issues. On top of that, you need a very new TV (with new HDMI 2.1 features) if you want to really experience the power of next-gen gaming consoles.
An older TV might work for your use cases, but I think you're increasingly in the minority. No one I know (except my parents) watches channels anymore, they all just stream Netflix/Hulu/Crunchyroll/Disney. If there's something really niche I want to watch, there's torrents and videostream.
Stay away from cheap Samsung TVs and get a good Sony TV. I love my Bravia x900h.