It's really interesting... Ive actually ended up going separate ways with a training partner because we didn't really see eye to eye in this.... Was always a constant struggle between me insisting on better form with less weight, and her stubbornness to always want to lift more. Still very good friends, was all amicable and ended on a nice high note (getting 4 records in her last meet - squat, bench, deadlift, total - and highest female raw total in Scotland across all weight classes
I think it's more important for the deadlift than any other. I've been meaning to make a couple of videos, as I have loads of my training partners battle with the deadlift as well as mine. For him, he was stuck at 170kg (sorry can't be bothered converting to lbs)... For like, 18months Atleast. He dropped a lot of weight as well in that time so this played apart as well. I have videos of him struggling with 160-170, form breaking down and the bar drifting on one side constantly. Then various videos working on technique with 140-160 until he gets a solid but messy 180....also have a 195kg, and then a failed 200, glued to the floor. Same thing thereafter, only now he's working with 160-180 most of the time, until the latest one when he got 200x3, one of the cleanest triples with 200kg I've seen in person. I'm certain he has 220kg in him right now. It's not so much the weight, which is of course a lot, but the solid technique it's done with. He now fails with good form, amazing really, so I actually make him go heavier than planned quite a lot just now.
On the other hand, I've picked up some bad habits after doing a couple of meets last year. I even lost the ability to actually "feel" my back and hip position. I would start off rounded when I thought I was arched... I blame the belt, as I could only ever get it to feel good if i let myself "crunch" into it during the reps. My technique with 190-200kg got WORSE after increasing my absolute strength by 20kg (220-240). So whilst I got stronger, I also drastically widened the gap between my "technical" max and my absolute max.... And I have enough experience to know where this road heads (plateau, pain/injury), having had to learn the hard way before.
So I'm now back doing what my training partner was doing. Closing the gap between technical and absolute max. I have a video to mark the start of this, a belted 210kg. The weight flies up but my technique sucks. My training goal is to clean that up, then train for another meet.
When I really fight for technique with 190-200, it feels just about as difficult as 240...
Anyway, it's been a while since I've rambled....