@Aissen Sorry @monkeyninja, Aissen is correct. There is almost no situation where it makes sense for a regular consumer to buy a "dumb display". You can just leave your TV offline and you won't have any problems with it.
Why buy a traditional "smart" TV?
1. It's subsidized. Vizio makes more money from ads than they do TVs. Buying a TV and keeping it offline lets you free ride on this.
2. Probably 10x or 100x smart TVs vs. dumb TVs are made per year. Economies of scale drives the per-unit cost down.
3. Commercial TVs have very different use cases than home TVs. Commercial displays are meant to look good or okay in a brightly lit retail environment. Home TVs are at their best in a dark or dim room (while still looking fine in sunlight). A commercial TV has to look "good enough" for someone to buy the product, or go to hall B at the convention center. A home TV is supposed to wow the audience, who is actively looking at it.
4. More traditional port setup and interface.
I ran an LG OLED offline for 6 years. You may want to update it every year or two (using offline firmware and USB) to perhaps improve performance - or it might make it slower. My LG is admittedly faster on local files after an update.
PSA: TVs can get slower when online. A family member bought a bargain-bin Phillips Google TV in 2020. When connected to the Internet, the entire interface, even changing channels, slows to a crawl. But if you factory reset it and keep it offline, it's pretty snappy.