It's really not that hard. I never understood how people find it so difficult to understand.

Monitors are made to be viewed up close for the most part. And as such they don't exist in TV sizes. There are a few, but they are super expensive.

Projectors suck. A good projector that gets close to the image quality of a decent TV will cost quite a lot. And the way they work, they don't always work in every room.

Inb4 digital signage. They suck too. They're made to be bright screens to be viewed outdoors or in bright large rooms and to be switched on all day. They don't have image quality comparable to an actual TV because they aren't made for image quality.

So yeah, if you want a large screen with good image quality to watch stuff on from your sofa 3 meters away, a TV is very very often your only realistic option. And since nobody makes a decent dumb TV anymore, you're essentially stuck with smart TVs.