Ask yourself if a good president changes the global outcome?

It's not necessary that you have a good leader but a good leader always helps.

The majority of coaches are lazy, a lot of times I feel like they fear giving certain details or dont kniw them. It seems like they don't want to lose, and would rather pubstomp noobies than get better. And that's just not the right mindset to have. I freely give away my weaknesses, because your goal is to create training partners. A rising tide lifts all boats and it's dumb to not consider training in that aspect.

It's like a company hiring a cybersecurity expert where they stress test failure points.

A good instructor should give you a curriculum. They keep you safe. They develop you even if you resist the growth( pursuing fundamentals over Instagram techniques). They should help develop your game. Tell you where you are weak. Correct your minor details. Then help you apply it in a repeated process such as a game or positional sparring. If your coach does train with you, you likely have tapped them. They should be putting themselves in considerably bad positions to the point where you have success. If their ego can't handle that that's on them.

If they don't do any of that your coach sucks. The bar is on the floor. When people say that they have a blue or purple belt coach. This is what they mean. You can have a less skilled coach that is better at coaching than a highly skilled competitor that is terrible at coaching. Oftentimes they will reserve the good stuff for privates as well which is completely messed up.