Bullshit. Range of AT guns makes that point moot
Plus the matches where you would do this are long ones with camping anyway. Cause your target would be artillery
Feel free to provide a replay with zis creeping in the back line even if it lost or even how long it going to get to do so.
Even if RW manage to get behind enemy lines before a game is the chance of RW successfully retreating from the back lines is extremely low so it hardly an issue.
As I have also pointed out there are also other solution. The currently implementation is simply bad for the reason I have explained.
Feel free to suggested another solution.