But reserving the right, or just saying 'Look, we don't know all of the cases where a programmer will say "and if the user corrects this, tell us we screwed up"

But reserving the right, or just saying 'Look, we don't know all of the cases where a programmer will say "and if the user corrects this, tell us we screwed up"' (for the optimist) is not the same as sending it all.