144Hz TVs are a thing and common. I'm using a 65" 144Hz 4K OLED right now.
Modern TVs are excellent gaming monitors, and they're much cheaper than an equivalent PC monitor. Especially LG OLEDs, since they are built with gaming in mind. Input lag is a thing of the past.
I've disabled the burn-in protection in the service menu (TPC & GSR) because they dim the screen too much and make text difficult to read. I left the remaining features in the user menu enabled, because they're not as dramatic, so I don't even notice that they're on (logo dimming and pixel shifting). The only other preventive measures I take are autohiding the taskbar and setting the wallpaper to randomly cycle every 30 minutes, but I probably don't even need to do that. I consider burn-in a non issue.
My gaming PC uses an LG C2 OLED. 120Hz, 4K, HDR, FreeSync. At the time, gaming monitors with competitive specs were all sold out anyway or way more money.
That said, I don't connect any TV to Wi-Fi directly, hate all that "smart" crap. The smart TV apps usually all suck compared to just casting from other devices to a compatible cast device. For example I just cast from my phone to Chromecast as my primary method of controlling my TV and consuming media on it.