The point is, it's an adaptation. Also, my anekdote... I used to play Spring RTS (and did a bit of development for). The behaviour that you describe is almost unobserved - instead everyone's loudly discussing what single thing (out of an unit class) is the most OP at a given time/map and should be "spammed". But then, it's open source and hard to install, so maybe there's a cut-off on IQ or age.