Agreed with WS: if you end up building units with the same stat combos anyways, what's the point? Sure, it can add a little variety, but after you get over the novelty of it, you'll just do the same thing every time you play. Fact is that units fit certain roles and a unit that is 4/1/2 defended by a 1/4/2 is far superior to having a 4/3/2 that is twice as expensive (or whatever). It's only when the AI can really give you a run for your money that more "generic" type units really pay off - attackers can serve as defenders and vice versa.