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I think possibly the point of confusion is that very early versions of MacOS X (the original MacOS X server, and some of the MacOS X DPs, anyway) used UFS by default, not HFS+. UFS is case sensitive.

I have a case sensitive HFS+ and everything works fine.

That was a problem with older versions of Adobe suite, but since lots of people on Macs used Adobe Apps...

Isn't the problem still present? A few months back I tried installing the latest version of Photoshop and Illustrator, and it didn't let me.

> was always glitchy (especially for boot volumes), because many applications depended on case insensitivity.

So CS HFS+ is not glitchy, and CS APFS will not magically fix applications with CI dependency.