depends wht you mean by failure
Exactly. I meant failure as in doing a set in a strict fashion and when you can't perform another rep in that fashion but start altering your mechanics you are now training beyond failure. Imagine Coleman doing t-bar rows, there can be no failure point because it all looks like shit from the beginning

My opinion is that you have to work in that zone where you almost can't do another strict repetition, that is where the adaptation is most likely to occur, if you always stop your sets when you could do 2 more perfect reps you're not getting far imo. Every serious lifter spends considerable time in that failure zone, many will do a couple of less than perfect reps too.
Since you are now capable of 3 chins all your free chinning will be 'heavy as shit' but of course no one will see it as that, "it's just some chins," few will say or think, "look at that fool, he should work the muscle, not his ego"

Heavy and failure has to be defined but those things are hardly bad if you think about it. If by heavy is meant you can't even do one correct rep then yes it's often injurious. Some define it by rep range, for example no one should work below 5 or 8 or 10 reps. Well I don't think you doing sets of 3 or 4 or 5 chins is stupid.
