I see the role for the 40-50t HIFV Track
I see a role for a <15t swimmable 8x8 (LAV-25, LAV 2.0 series vehicles)
They lost me at the 28t swimming track.
I do see a role for a 3rd type of armored vehicle, but that would be a BvS10 <10t swimmable track - mainly for northern mobility.