Its already low rof gets lower when one uses the flare.
I dont know the excact numbers, but in my experience a single mortar gets of about 2 shots while the flare is in the air.
Again to truly gain a benifit you need other arty. Meaning extra investment in arty needed to max out its use.
Also people should be carefull with what they wish for. Removing the flare could lead in bringing precision shot back.
precision on the 82mm only shouldn't be that big of an issue.
If your support weapon is down to the point where a "lucky" 82mm mortar can take it out, it's time to retreat.
mortar is still affect by heavy cover, and both axis faction can build sandbags. They are not just for your frontline units.