Hmm the way it works now with TOV, it does work okayish. Believe me I prefer not to have such system either, but if that is what it would take for Relic to update COH. Than why say no?
Like most of the current TOV units are in a bad state and need some new redefining.
They need a unique characteristic, while still being the same balancewise.
You don´t know what you are talking about. The problem is the idea behind it, which leads to a bad design.
Each unit in each faction has a purpose for a particular strategy or counter. You cannot add or exchange multible units (which are supposed to work different than the units they replace, to be of interest) in a closed system, without severely alter the gameplay and thus the balance.
A vehicle, that replaces a stug, needs to work just like it in order to not change the gameplay. However thats contradicting the idea, that a replacment unit should have a different characteristic.
Gwagon is at first a anti tank unit, but the stug can fight infantry and tanks reliable. However the non doctrinal gameplay of USA involves rifle spam and doctrinal there are 2 anti tank infantry squads, the Gwagon cannot defend itself against.
How you want to fix this? It will end up to be just like the stugIV.
Thats also the process the M18 went through, just its now much better because it does not have a missfire bug and can cloak.