I grow the most when I can isolate and identify my problem. You have to roll to find this but drill to fix it. And once you find the problem you have to find the proper technique to drill. Many times stuff fails because we try to force a square peg in a round hole. It's like trying to beat a nail in with the side of a wrench. Sure, you'll get it done but this is negative reinforcement. Over time you may get even get better at it, but as soon as you use a hammer you will never use a wrench again and wonder why you used the damn wrench so long in the first place. Being able to properly analyze your problem, then use the proper resources to find the right tool is invaluable. Of course you could also be using the hammer the whole time, but just need to turn the damn thing around.
I also agree that losses in competition expose these issues blatantly. Believe it or not, training around injuries also force growth. You have no choice, but to slow down and roll outside of your comfort zone. Proper form is paramount to make a tech work in this case and it stays with you when you heal.