I also disagree with a lot of the reasoning. Like “If a commit has the same content but a different parent, it’s NOT the same commit” is not an “alien concept”. When I apply the same change to different parents, I end up with different versions. Which would be kinda bad for a Version Control System.

It's also intuitive, it's how frames in video compression work, too. And in fact if you have two kids that look virtually identical but are from different families, they are very clearly not the same person. Context matters, most people more-than-intuitively understand that.

“Git uses the cached remote content, but that’s likely out of date” I actually agree that this can lead to some errors and confusion. But automation exists - you can just fetch every x minutes.

Yeah and nevermind that virtually any tool does that for you. So this is a long-solved problem.