I know developers are busy, and I don't mean to berate them for their choices or work. I only have a two year Computer Information Systems degree and haven't programmed a lot for a while, but supporting the XDG specification and remaining backwards compatible doesn't seem to be very difficult or would cause so much breakage (of course, the amount of work would depend on the software and how the hardcoded path is implemented). I look up git repository issues for the software and tend to find ubiquitous examples like vim to be resistant to such change: https://github.com/vim/vim/issues/2034

This is really frustrating and leads me to find alternative software, such as neovim/doom emacs instead of vim, nushell instead of bash, etc., just to be able to clear up my home directory. I don't mind if I have to wait for XDG to be supported, but many important projects just label the issue as "won't fix". I totally understand where you are coming from.

List of software with hardcoded paths at this time: https://wiki.archlinux.org/title/XDG_Base_Directory#Hardcoded