>>725137827 (OP)
>brood war
>units roughly maintain the formation they had when they were moved
>sc2
>units all try to get as close to the target as possible
Sc2's method leads to boring deathballs
BW's method rewards adjusting the units individually aka micro
There is basically no advantage to "micro" with big armies in sc2, just a-moving gets you probably 80% effectiveness, and selecting a clump to right click down enemies individually gets you 99% perfect micro
Sc2 tried to add depth by adding more and more active spells on units, which just isn't what you want in an RTS.
Combined with lack of environmental depth e.g.
>>725137860 and sc2 is just boring
