The BMT-72 and BTMP-84 are concoctions of the Morozov design bureau in Kharkiv, Ukraine, representing a tank-IFV, that can carry, besides three crew and a 125mm gun, five soldiers. The BMPT-84 at least had a rear door and raised rear compartment, while the BMT-72 plopped in a troop compartment between the turret and the engine with roof hatches (it looks as ergonomic as it sounds).
I’ve seen it be widely criticized, and understandably so. It takes two vehicles with contradictory roles and mushes them together. However, there’s a part of me that thinks it could be somewhat salvagable as a (western-style) cavalry vehicle, with the dismounts acting as something other than line infantry, something other than just “ok, rather than dismounting from the BMP/BTR behind the tank, they dismount from the tank itself”.
Of course, a separate vehicle holding the cavalry scouts that puts the eggs in more than one basket is still probably the better option, but it’s the least bad way I could think of such an unconventional tank to be used.