> And why should they? I don't know where my browser cache is either.

This makes it a pain where you want to have a custom configuration. Like moving the cache to a ramdisk. My NVME disk is plenty fast, but rarely I want my browser cache to persist across a reboot. It's a pain to move the cache to /tmp/firefox-cache as an example (/tmp is a ramdisk on my laptop). Also a pain to backup profiles.