We have to remember that while, Battlemechs are the most played units in the Inner Sphere, fluff wise conventional forces really make up the larger portion of an army - most of the time. Just look up a RCT or a LCT, and LCT is one battalion of mechs, 2 battalions of heavy armor, 2 battalions of cavalry, and an artillery company. So the Fronc Reachs would be the same if not having a higher percentage of conventional forces.
OMG, battalions of hetzers coming at Battlemechs, I like it.