Interestingly enough, this issue about mouse pointer behavior was being discussed right here on CN fairly early on and even before some of the content on Twitter and elsewhere. So, I guess maybe the writers on CN could spend more time reviewing forum content here on CN rather than looking afar on Twitter and Reddit.
That said, and following on to some of my earlier posts on the notch and mouse operation, I think that the behavior that Apple's user interface designer has revealed shows that there is really no "perfect" solution to this issue.
IMO, the fact that the mouse pointer can disappear and become hidden under the notch isn't an ideal user interface behavior, but that may be the best that can be done since any alternatives could introduce even more serious user interface issues.
The problem with most alternatives is what do you do when the user approaches the notch from below and at an angle to the menu bar? That's not as simple of a case as just moving the mouse from right to left (horizontally) as shown in the animation on Twitter. These kind of angled movements add all kinds of issues to the proposed solutions shown on Twitter and as I noted earlier (ahem, here on CN) it's probably quite difficult to determine the "best" behavior until you've actually tried it on one of these notched displays.
In any case, all of these user interface issues with the notch can be or will be addressed in software (with varying degrees of success), so they could be subject to change in the future.
Oh, maybe I should add that I'm not particularly bothered by the notch itself and it certainly wouldn't prevent me from buying a newNotchBook MacBook Pro. 
That said, and following on to some of my earlier posts on the notch and mouse operation, I think that the behavior that Apple's user interface designer has revealed shows that there is really no "perfect" solution to this issue.
IMO, the fact that the mouse pointer can disappear and become hidden under the notch isn't an ideal user interface behavior, but that may be the best that can be done since any alternatives could introduce even more serious user interface issues.
The problem with most alternatives is what do you do when the user approaches the notch from below and at an angle to the menu bar? That's not as simple of a case as just moving the mouse from right to left (horizontally) as shown in the animation on Twitter. These kind of angled movements add all kinds of issues to the proposed solutions shown on Twitter and as I noted earlier (ahem, here on CN) it's probably quite difficult to determine the "best" behavior until you've actually tried it on one of these notched displays.
In any case, all of these user interface issues with the notch can be or will be addressed in software (with varying degrees of success), so they could be subject to change in the future.
Oh, maybe I should add that I'm not particularly bothered by the notch itself and it certainly wouldn't prevent me from buying a new
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