I feel the Wehrmacht's "get out of jail cards" are more or less fair enough in their own right considering blitz requires vet 1, and tactical smoke requires certain doctrines. Where as Sherman smoke requires no doctrines, can be fired in direct areas while on the move, and allows for good sight blockers of enemy at-units, but is also fair considering how stronk USF armor is. 
Finally, an accurate and non-biased analysis. Congratulations sir.