True, sometimes I realize I need to do something half-way when doing something else, then I do a "WIP commit", do another thing and commit that thing (sometimes in a separate branch forked off master), then perhaps reorder commits if needed, and go back to continue working on the previous thing (and amend the "WIP commit" once done)

The tricky thing is that when doing several things without committing, sometimes you can end up in a state of the repo where you can't split the work done into nice commits anymore (because you might have modified same part of code multiple times).