but it is ok to right click ur machine gun on same place without any flanking, tactic, reaction, attention and just suppres->pinn->kill squads? Actually CoH2 consists of "out of jail" cards, should shocks loose smoke ability when they get suppresed? Should players wait untill nades explode and loose their troops before they react? 
that time between suppresion and pinn is ur reaction time, and ur deciding factor if u will prevail and take out enemy
If they loose that ability that would mean only option is to retreat (for most units), which doesnt sound like anything fun or strategy wise. MGs are pain in the ass as it is, no need to give them even more power
I do not demand über hmgs or something, but usually when you get caught in an mgs arc of fire it costs you something to get out of it, for example you need to lob a smoke grenade, grenade, molotov, rifle nade or you need to send another squad to relief the suppressed squad.
By entering a building you get away for free.
To put it in another way, What if units would stay suppressed when inside of a building? I mean crawling into yellow/green cover doesn't break suppression either.