My comments weren't about being perfect. In fact I am far from that myself especially in regard to guitar playing. I do think though that if you are playing to people - who may not be paying but are there to enjoy themselves all the same - then some amount of basic preparation should be done. That is have some idea of what you are going to do (I concede someone may then change their mind) rather than always spend the first few minutes of your turn flapping about deciding what you should do - and if you are playing guitar accompaniment yourself then write down what key you play it in so you don't have to regularly stop after the first verse and start over placing the capo somewhere else. Things like that are just little bits of basic preparation that have little relevance to actual musical/ performance ability.