People on here seem to have it twisted. Full screen apps will obviously still be full screen … there will be simply the option to have additional information shown on either side of the notch but once you enter full screen mode (e. g. watching a movie) it will simply turn black, basically leaving you with a „digital bezel“.
Well, I have said in another thread that one person's "notch" is another persons "ears"...
However, there are a couple of flies in the ointment:
If it is going to take a bite out of the menu bar (which, if you take the "ears" view, means moving the bar up and leaving the main area of the screen free for content) - and separate the left-hand menu headings from the right-hand icons : first, the height of the menu bar varies depending on what screen scaling you choose, so it's going to have "overbite" or "underbite" depending on the screen mode - which would look fugly (which is not good for something that is clearly motivated by "form" rsather than "function").
It would also enforce a half-and-half split between the left-hand and right-hand sections of the bar when, in practice, the left-hand part tends to need more space than the right-hand part.
Or, let's say that this is going to be pure "extra" space, not accessible to legacy apps, purely for newly added icons. First - what new icons? Is anybody asking for this? There doesn't seem to be any pressing need.
What background colour? If it's a "digital bezel" (i.e. black) then you're back to the uneven bezel/forehead "look" - if it's white or matches the menu bar then... well, that's a big extra block of white at the top of the screen (which will call attention to the notch). All of the mock-up photos seem to show it continuing the desktop background (which is gonna muss up the aspect ratio of photographic backgrounds) which breaks as soon as you display the menu bar underneath it...
Are the icons going to be mouse-accessible? Will that mess up full screen games that capture the mouse?
...then you're going to need a control for hiding them - because you might not want bright light-on-black icons hovering over your full-screen movie or game - so that's an extra complexity to add.
Trouble is, I can see this looking really cool in a few mock-ups of carefully chosen cases produced by a graphic designer to sell the idea (I mean, some of the amateur mock-ups don't look bad except they've conveniently omitted windows and the menu bar) but fugly in real life.
Also - Apple really need to remember the lesson from the Touch Bar, Force Touch (& maybe the Pencil) -
don't use UI features to distinguish models. Unless you're gonna roll out the feature across the whole range so everybody can use it, software producers won't make too much effort to support it. If Apple were going to go down this route, they should have included it in the 24" iMac design
(
NB: something occurred to me while writing this: all the fan mock-ups appear to show black bezels and, consequently, a black notch... now, I'll be happy if the "pro" Macs stick to a businesslike black/grey/silver scheme, but I thought that white was the new black... what's it going to look like with a white bezel & notch, plus a desktop background colour-coordinated with a coloured base?)