Yes, hot mics are extremely annoying.
I agree, some people need to understand less is more. Taking up the comms for 30secs to describe a hostile activity takes away from fighters coordinating the attack. I'm slowly learning how to be a better GCI round by round so that there are better engagements.
Knowledge is an asset, but not a necessary requirement. I have very basic knowledge in DCS but if you ask any member on Bluefor who I have partnered with, they would tell you that my work is extremely helpful.