I have no issue with the mechanic, I only have a problem with that it's very unintuitive and players are only going to figure out about it by getting pancaked by it or from other players' telling them. It can be very significant and so I'd rather like at least a small tutorial cluing new players in on it.
If we were to largely remove the mechanic of tanks crushing by turning into infantry, it'd only make sense to go about that by greatly reducing tanks' speeds to turn...which I'd also be OK with since it'd be a secret flanking buff.