Disagree.
For example, if you cheat on form when benching, what you are performing is not a bench press it is something different. Not only that, but you often risk injury.
If i am overhead pressing, and i use leg drive to get that last rep out, that is not an overhead press that is a push press. The strength isn't coming from my shoulders, it is momentum from my legs.
If you let your back round on a deadlift the strength isn't coming from your muscles because they have failed to keep tension and your back has rounded - the stress is now on your spine.
Its very easy to get a weight from point A to point B through any means possible, but you aren't necessarily doing the exercise you set out to do.
If you can't do it right, you can't do it.
If you hit a plateau, identify where in the movement you are stalling and train to improve those elements.
For example, powerlifters often train using boards on their chests to isolate certain portions of the bench press rep to work out sticking points.
It also might be a flaw in your programming, so do some research and figure out why your program isn't getting the results you want.
Perhaps its an issue with your pre-workout nutrition?
Perhaps its your buildup to those max attempts?
Maybe you aren't getting enough rest?
Maybe you need to focus on a different variant of that exercise for a while to give yourself a break?
There are a million factors as to why strength increases stall, but sacrificing form for the sake of weight is dangerous, and frankly a bit of a cop-out.