I use emacs and org but sometimes I just want to make one or more quick notes. Sometimes it's genuinely a disposable, transient thought so I viewed org-capture as overkill. Sometimes, I might want to remember what I jotted down and extend it the next day.
I tended to use the scratch buffer and then save (if necessary) to '~/tmp/xxx.txt'. This was clearly sub-optimal.
The built-in #Emacs remember package is much better. Can't believe I've only just discovered it.
https://www.gnu.org/software/emacs/manual/html_mono/remember.html