This is what I do already but aside from the "neighbors open wifi" problem I'm more concerned about:
-In-laws or other visitors "finishing setup" to use their netflix while I'm at work or something.
-Future TVs including 5G modems.
-TVs demanding internet access to work at all or worse working but with a hidden time out that waits until after the return period to activate and disable the TV until I give in and let it on the internet.
Most TVs seem to have removable wifi modules, or at least they did. But throwing away the warranty removing it on day one doesn't sit great with me. And that doesn't protect me from point 3b.