Marauder Meat said, you don’t get big from liftin little weights with perfect form. I’ll listen to him since he rows 400+ for reps.
MM is a beast - he’s a huge & strong man, that’s for sure.
However, his laundry list of injuries is pretty daunting. Then again, he doesn’t care, and has balls of steel working thru some of the shit he’s had going on.
But, if you do care, then I’d say as heavy as possible with good form. I wouldn’t say perfect, but good enough so you can go just that extra little bit heavier at your top poundage and not get hurt. And I’m not saying MM has poor form, I’m sure his form is fine.
There’s no argument as to whether you should go heavy to build as much muscle as possible - you absolutely should.