Comment by rch

You nailed it - getting rid of spaces and dashes and underscores is extremely human-hostile. People added spaces to the English language for a reason, and that's because they make it way easier to read.

Your system is only intended for other programs to interact with? Go nuts, make hex UUIDs. Actual people are supposed to use it? You need separator characters.

I also don't see how those characters add "extra complexity" unless you're doing dumb things like text processing on paths and filenames (as opposed to using OS/library functions that handle paths correctly) - in which case, there's your problem.