Jack of all trades, Master of None.
Any normal tank has very little space inside, because most of it is taken up by ammo storage, engine space, or armor. Increasing the space for soldiers will make it an easier target or reduce the armor, making it a worse tank.
In addition, adding heavier armor and a turret to APCs means troop transport is slower and usually requires more vehicles to transport the same number of troops.
There are a few stories of failed tanks that went that exact way; trying to fill multiple roles, but ended up being bad at all the roles.
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