Question about vehicle types

Whats the reason behind choosing the MT-LBM 6MB over the BMP-2 and BTR-80A? It seems absolutely bizarre that you guys chose to create a model for that instead of a run of the mill BMP-2.

How far are you guys willing to go when it comes to vehicle variants? I saw that you are including the Stryker and there is a shit load of variants for that vehicle.