I've noticed recently now that I've gotten into higher reps that belts seem to really help with endurance under load. I recently did squats with 240 beltless and struggled on the fifth rep, but a week later did 8 reps with a belt. Deadlifts too. I struggled with 275 for 5 no belt, but hit 280 for 8 with a belt.
My point being I think the belt gives you endurance. So when you are maxing out with huge weight, you will survive the attempt, like you would not have if you had no belt for those few seconds under a max load.
But the next time you need the belt, it will be at a higher weight (my belief).
Just saying it's silly to worry about belt or no belt, you have to pick up the load no matter what. A belt will not help your grip or your legs if you can't handle a heavy squat or deadlift.
I am Anton Zdravko Martin!
Best meet lifts: Sq 150 Kg (330 lb), Bench 120 Kg (264), DL 160 (352) @89 Kg (197)
Best gym lifts: Sq 375, Bench 280 (pause), DL 385 @205 or less
Goals beyond my wildest dreams, 600 Kg raw total, 200/160/240
Hack away at anything which isn't essential. Do what you love, and do it often. Fazc.
Everything competes for recovery so more assistance is not always the best idea. miked96