Here's a quite common scenario:
Have 2 Panzerwerfers
See sweet juicy poorly placed USF major retreat point with all his infantry blob retreating to it
Order Panzerwerfer to find dat booty
Your Ally notices too, but since this is not a teamspeak team and is randoms, he doesn't know english and you can't warn him
Ally sends his gren LMG blob to the major retreat point and arrives just when your pzwerfers fires
Lose the game because you killed his entire army.
Hahaha yeah this guy knows what I mean
But I still prefer the realistic model cuz it's unfair that allies need 0 care with their arty usage, but axis don't.
And to be honest, if someone doesn't react on the pzwerfer rocket sound, nor he understands english and ignores the ping signal, then its just totally his fault.
There is no need to design a game assuming that the players are THIS slow/dumb on reaction time
Light-headed arty usage just needs an appropriate penalty on BOTH sides, and this is a team game Keepo
-->coordination/communication also should be a part of things like artillery