Weight cutting (also known as a water cut) is an area of powerlifting that I see not being done well on a frequent basis. Honestly, I see it as a bit of a gap in the sport where people are missing out on a massive potential advantage.
In a lot of combat sports where making weight is a requirement as well, it is at the point where almost everybody undertakes a significant weight cut. If an athlete chooses not to do one, it puts them at a noticeable disadvantage due to the difference in size and muscle mass.
Interestingly enough, even though weight cuts can provide an advantage, they haven’t become a part of the culture of powerlifting, which is why I see it as a bit of a gap.