Popping out of an AFV to seize building control is another abstraction IMHO. Who says that you can 'Control' a building merely with Infantry? What would scare you more not to approach a Building - a tank right next to fully manned and operational it or its crew inside the building? Which of the two actually exerts more 'Control'? 'Control' itself is an abstract concept in ASL.
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IMHO criticizing grabbing Building Control with a Vehicular Crew after Abandoning a Vehicle or the other examples as unhistorical is beside the point, as already the concept of 'Building Control' in itself is an abstraction in the game and could well be contested from a 'historical' perspective. Only if you do not question the concept of 'Control' itself, then taking it by with a vehicular crew from a vehicle Abandoned for the purpose does appear to become 'ahistorical'. Historically, you could instead argue, a fully manned and functional tank is much more in control of the house next to it, than its vehicular crew within the house ever could be. Then again, the idea of a 'building' is an abstraction. What I just said might be true for a normal residential house represented by a single hex building depiction. But this depiction (despite having only one level in ASL - yet another abstraction), could well represent a larger house with more than one level, which in reality, neither a fully manned and functional tank nor its crew somewhere within that house could really 'Control'.