Agreeing with Stabbey's point, the developers are choosing to go for a more vehicle focused mode of warfare to illustrate larger than life battles. Now, is that to say that infantry are not being used in the war? Of course not, likely in the background occupying cities but not on the battlefield. The creation of mobile and inexpensive mechs has filled a niche in battle that could once only be filled by infantry (the glorified mobile weapons platforms that they are).
I think infantry would simply muddle things up, they would be cheaper than tanks and mechs but not as good and so then why bother with them to begin with? In any event there are aesthetic reasons for using only vehicles - they are far easier to animate and polish for looks than infantry who would invariably be more complicated pixel wise lest the game lose it's luster.
Last edited by Fernando; 10/03/13 03:20 PM.