Full screen stuff isn't supposed to go behind the notch, unless they opt in to supporting it. By default, fullscreen stuff just gets the notchless 16:10 area under the menubar, and the menubar area goes black, so the notch becomes invisible and nothing is "glaring", it just looks like the top bezel of the screen is larger.

I get what you mean, but to me it just looks like before there was a notch, like there's no screen there. I can't really tell where the bezel ends and the screen starts if it's all black. Just looks like a large bezel.

Guess it's just a matter of taste. I'm never bothered by it.

But if you hide it in a small bezel or behind the LCD you will get significantly worse camera quality.