the tank as it is now really fails in urban environments, hence this is my take on mechs.
the combat walker:
with the days of large, treaded cumbersome tanks comming to a close, and infantry armour not up to the task, here comes the urban pascification unit. This combat walker is ideally suited to the urban environment, packing enough firepower to see off any tracked armour, air carriable and deployable from any altitude, packed with a full sensor suite, anti-personell weapons, grenade launchers and AA.
just fitted into a unit slightly bigger than a human, think an armoured version of the loadlifter from aliens.
This to me is the perfect mech, filling the void between infantry personal armour and tracked/grav armour, that will still suffer in the urban environment.
Battledress as is is available to mainly the marines, for deep space, boarding actions or lightening assults where they need maximum impact in the least amount of space. but for planetary armies, along side the grunt infantryman, grav armour platforms and atmospheric assets there is a need, as there is now, for better armour to be available that doesn't have the limitations of the above. battledress is in my mind just an armoured suit with an exoframe designed for infantry to carry some big guns and to improve their survivability, for extra punch and for close in support i think the combat walker makes sense
Chef