ORIGINAL: Ognis
Because drummers are the worst musicians in a band.
Let me explain something to you. Drummers have a NATURAL feel for rhythm. When you put a metrodome (I know I spelled that wrong) to us, you throw us off. Simple as that. .
Man, how things change !. Back in the "disco Era" of the 70's when 10 piece horn bands were the norm and the drummer played everything behind the beat except the kick, your method would have been a real hoot. I can see it right now. Horn section players falling all over each other and REAL dancers numbering on average, 200 - 400 people on the floor in the average beach club around here falling down on the floor trying to follow the drummer who is in his own little world. Yep, he wouln't have lasted 1 night.
Hate to burst your bubble but, even then, drummers worked to a in ear metronome with tempos predetermined by the bands arranger, not the drummer.
Playing to a click is difficult for some people BECAUSE they can't keep time, because, they haven't practiced it for years on end. To busy recording, I suppose.