And don’t you dare changing it unless you like random bugs

Sell me on this. Why would you want to change it? What good can actually come of allowing foo and Foo to coexist in the same directory?

Practically? Quite a few codebases from *nix systems rely on the case sensitivity. To do a successful git clone you need a file system that handles both Makefile and makefile, or whatever.

I ran into it more than once back in the day when I used Mac OS X as my primary OS.

More generally -- case sensitivity is a conceptual nightmare in the Unicode era. Should Cyrillic or Greek be case-insensitive as well? Etc. Do you really want the full complexity of Unicode string handling in your file system?

I would suggest treating file names like raw bytes. On modern Linux, anything but NUL is valid.

> anything but NUL is valid.

And slash/!

Sometimes you download stuff that relies on case sensitivity. Anyone who's dealt with this probably has a sensitive RW DMG lying around for this reason. But macOS FSes default to case-insensitive, so random issues come up if you make your root sensitive (famously in Adobe software). Damned if you do or don't.

Another weird thing in macOS:

  $ mkdir Cased
  $ cd cased
  $ pwd
  /Users/me/Downloads/cased
  $ cd ../Cased && pwd
  /Users/me/Downloads/Cased

So yeah I wish the FS defaulted to sensitive, even though I never rely on that. Not its job to normalize names.

TIL that MacOS `pwd` has `-P` and `-L` options.

     -L      Display the logical current working directory.
     -P      Display the physical current working directory (all symbolic links resolved).
     If no options are specified, the -L option is assumed.

In your example, using `-P` will show `Cased`.

It can be nice to checkout some Git repositories that have this. It can also be nice to catch miscapitalizations of filename imports when those would fail on Linux, etc. One of my past workplaces actually had that problem, they mis-cased imports and the product failed to build on Linux. Nobody caught it because they all used macOS or Windows, I was the first to try WSL (this was before I switched back to Mac)

You would be asking for a world of hurt to put your root filesystem in a case-sensitive volume though. All sorts of software and applications have silently relied on case-insensitivity for decades. You can sometimes fix it on a case-by-case basis, but sometimes you can't, and it's also annoying for it to happen in the first place. Better to have a separate case-sensitive volume just for the stuff you want to be case-sensitive.

They are completely different words. Why should they be used to mean the same thing?