> If the notch was replaced with a 1cm bezel, then the entire top menu bar would move down by roughly 1cm, and I'd have less screen space for actual content.
That perceived 1cm is largely meaningless for content. And you get less space in the top menu bar.
> Personally, I've never run out of space in my menu bar
I have 27 icons in my menu bar. Not because I collect them, but because quite a few apps add their icons there and I use a few of them.
On the laptop screen it manages to show 10.
IntelliJ idea has 12 top-level menus (I swear they had more). On a laptop the top menu bar manages to show 10 items on the left of the notch, and has to move two more to the right. This both splits the menu for no reason, and reduces the space for icons even further.
The notch has been around for 4 years now, and Apple still hasn't provided a solution for the problem they introduced.
And, of course, when you want to truly take advantage of "more content" you can't because the "safe screen space" without the notch is still squarely below the notch, and apps have to to be very careful to actually use that, or the notch will get in the way.
> It's nothing to do with thinness.
Yes, it does. In this case with thinness of bezels.
> Sure, you could argue to just make the laptop 1cm higher for that bezel
Yes, you could do that if you didn't have an institutional psychosis about thinness everywhere.