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Case sensitivity does already exist, it's just turned off by default.

Apfs ist case-insensitive by default, probably due to legacy reasons.

I've tried to use macOS with case sensitive filesystem for some time (before APFS). Works mostly fine but there're applications that break (Steam and Intellij IDEA are the two I remember).

Adobe apps are another known candidate for breakage on case-sensitive filesystems.

I've no problems with IntelliJ in recent versions. Steam remains broken, I have to run that from a separate volume.

there was a tremendous ATP episode about this exactly, maybe 6-9 months back. John's explanation of case sensitivity and file systems is a real gem, if anyone can remember the title

I think not. suddenly changing something like that could break a lot of applications