The comfort zone is very a dangerous area. We feel good on it doing what we know, safe and confident which consequently generates a barrier to anything else other than that.
And that’s the problem. When we are comfortable doing what we know how to do, the evolution does not happen. In comfortable situation you don’t have to evolve, you don’t have to do anything different than what you already do.
In Jiu Jitsu we can have many different comfort zones, but the most common one is always trying to do the same technique or same game. Of course if you domain and feel good doing some technique you should to train to improve and become extremely efficient. However it is important you put yourself in uncomfortable situations so you can evolve in different areas of your game.
If you are a guard-passer you should train a bit more guard, if you are a guard-puller train a bit more passing. You will not just develop and improve a different area of your game but also would make you understand better what your opponent needs to do to defend a passing guard or a sweep and, consequently improving your main game.
Jiu Jitsu is about evolving, and the evolution just happens when you challenge yourself to do different.