Does using your laptop to feed a signal to a monitor meet your needs? You can find large monitors that are indistinguishable in terms of screen quality from a modern television.

It can be annoying, but just running an HDMI cable from your device to the TV can be a simple solution.

You could use a laptop with no network connection and load it up with videos, or or just run your various streaming services in their own Firefox container[1].

You can add a TV tuner later on if you decide you need to access basic cable. (I got one back in 2016 to watch the debates).

[1] https://addons.mozilla.org/en-US/firefox/addon/multi-account...

[2] TV tuner https://en.wikipedia.org/wiki/TV_tuner_card