Why are installers/sources for installed formula stored in cache after being installed?
More specifically, what is the purpose of keeping these install files? They just take up space on the drives.
I researched cleaning up cache brew cleanup but it does not remove files for current versions installed, but what is the purpose in that? If it installed properly, why keep these? I know we can remove them with rm -rf $(brew --cache), but I feel like brew cleanup should remove all of these files, or at least have a flag for it, which is why I want to understand a strong reason why these are kept.