So this is framed as a "things we should have done back then", but I think that the part about case-sensitive filenames show why that wouldn't work: "Of course

So this is framed as a "things we should have done back then", but I think that the part about case-sensitive filenames show why that wouldn't work: "Of course we tried to be smart in the early days, but if you don’t set up a way to actually verify that what you’re doing works on a case-sensitive file system, then it will never fail that some well-intentioned programmer throws a toLower() in somewhere and ruins the party." Because yeah, if nobody's running or testing a code path, it will absolutely decay. You can't write anticipatory code to work for hypothetical future requirements that you don't necessarily understand and are never testing.