>>64238352 (OP)
the M2 bradley carries 2 less people than an M113
you lose 2 riflemen, which reduces redundancy within a squad, which isnt an ignorable drawback
but what you get for those 2 riflemen is a 25mm cannon for knocking out heavy targets, an additional M240 for spraying down infantry, a missile launcher for hard to reach spaces, and the associated thermal camera on the cannon for spotting threats
and unlike an m113, the M2 stays with the squad and acts as an additional squad member in combat instead of acting as a seperate element once empty
at a platoon level, the loss of 6 men from each squad mostly means the loss of the dedicated weapons company, the MGs and missile launcher
which is a pretty big loss until you remember each M2 has its own MG and an autocannon on top of that, so you arent exactly lacking a base of fire