I only really have buyer's remorse over expensive items as I can't replace them easily if they turn out to be duds/not fit with my workflow/etc.

I do sometimes wish I could not have spent time on things I spent time on, but you always learn something even from wasted time (even if that thing was "that was a waste of time don't do that again/avoid people like that in future").

Eater's remorse? Well you learned not to eat those things again ;D