Yeah and? You think I care about using munitions on smoke if it means I can totally negate all my enemies defensive efforts?
"Hey guys obviously the maxim and other allied MG's are not preforming up to standard so lets buff them"
"good idea mate and while were at it lets give all Ostheer vehicles that can use panzer tactican if you have the commander equipped be able to totally negate them by throwing smoke everywere
Maxims in the way? Just through smoke from your 222's and HT's to cover your movement. They try to reposition? Just throw more smoke on them because you have 3 other vehicles that can do it too!
... and you are out of munitions. Each useage of the smoke is expensive, which means that you will be absolutely drained.
Ostheer isn't exactly a faction that floats munitions, and as a result if you smoke spam, you will have 0 lmgs, 0 tellers, 0 panzershrecks, no riflenades, etc.
If it becomes a problem, it can always be tweaked. It will definitely be less gimicky than the micro free get out of jail free card that Panzer tactician is.