Beware feedback from colleagues.
Updated: Nov 25, 2020
It's low cost but it's dangerous. Is it a good idea for a tennis player to turn to spectators to ask for input on their swing? He or she might get, "Your competitor grunts loudly when they hit the ball. You should probably do that too!" Whereas an expert coach would say, "Drive the ball of your back foot into the ground as you initiate your swing."
I meet people all the time who have taken non-expert feedback and tried to adopt it. Someone once told them, "You talk to fast," or "You use your hands too much." As an expert I can tell you, these two common bits of feedback are almost always wrong, seldom stick and occasionally make things worse.
So if you choose to take feedback from a non-expert, beware.