Based on the SammyGo project - https://www.samygo.tv/ - I'd say that it's relatively difficult, I think in most cases people are inclined purely to attach a HTPC or something similar to the TV and then just use the TV as a dumb monitor.

I think we are still a few years out from having to worry about TVs that need a constant internet connection - I connect mine to the internet whenever there's a firmware update that interests me, but for the most part I leave mine disconnected from any sort of internet.