And people are actually good. No point practicing one taps in valve dm when 90% of the players jump around like headless chickens when you start shooting at them.
n0thing, freakazoid, shroud, pasha, olof, tarik, roca literally any pro uses community servers to warmup. Dm and aim maps so much because they're full of brain-dead idiots who only know how to aim, who make good bots for pros.