I play drums professionally, and have several kits. They range in size from 4 to 7 pieces and I can mix and match whatever I want.
Although I have numerous choices, I find that most of the time I play the 4 piece kit with one mounted tom and one floor tom. The kit I bring most often to gigs came with a second mounted tom, but 99% of the time I leave it home.
Over many years of drumming, I've found that groove trumps flash almost universally. I simply don't need many drums to do what I do. Another mounted tom also forces me to put the ride cymbal in an uncomfortable position, too far to the side.
Most of the newer music I listen to, places great emphasis on the beat, and not so much on fills. Four drums is fine, and if you want to add a 5th, another larger floor tom will give you a real big sound. It stands up well to loud guitars.
Rock drummers tend to use more cymbals, and the single mounted tom setup leaves room for them.
Hey, when the gig is over I guarantee they'll remember you if you kept a great groove.
peace
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