you've got one foot in both camps here now. Your saying it should require micromanagement and you should have to start leaving before the opponent overruns you, but then you say what makes it interesting is that it's fragile and can't get away. What is it? If a 222 suddenly arrives where you are reinforcing, you just lost ambulance. PanzerIV shows up, lost ambulance. Tiger shows up, lost ambulance. Falls come out the building behind you, even if you rip them up, your going to lose that ambulance. The way it is right now, it's very exploitable. Yes I know trading 400mp for a 250/10 unit is not a smart trade, but if timed right it puts USF over the slippery slope. Even with good scouting it is a challenge to get the ambulance out of harms way and micro tends to be trumped by how much of the battlefield you can see.
Yes, I suppose if you have no other the units for a PzIV or whatever to shoot/not drive headlong into because of AT, it might catch your ambulance.
Do you not use true sight to hide your ambulance or something? I'm saying that slow acceleration = start driving sooner. That isn't having a foot in both camps.