You know what I'm saying?
Over longer cycles it's silly to get bogged down in specific expectations for Lift C, following Lifts A then B.
Correct. To a degree as long as SOMETHING about that lift is getting better you are okay. Whether it be weight, reps, form or whatever.
It's more beneficial to find out what you can do when fresh for Lift C occasionally.
I guess, but that isn't why I would swap it specifically.
So many life factors will impact what you can do on a given day, swapping order is just one more way to find out how you respond.
I would change this statement to: So many life factors will impact what you can do on a given day, swapping order is just one more way to find progress
Swapping order is a quick and insanely simple way to change things enough to illicit change and progress. And it keeps your emphasis revolving enough were it rounds out your improvement so that over time, you aren't lacking somewhere simply because you always put it behind a super intense other lift.
Now, you prob don't have to put leg curls first, ever, unless you are going to compete in a BB'ing contest and have crap hammie development, but you know what I mean by above.