Mortar sucks
As a former airborne infantry squad leader I feel like I have some insight on this. While I wasn't an 11C I have hung mortar rounds on several occasions.
If you're going to have a mortar system in the game that highlights you for everyone to see those mortars should be useful. As currently implemented they are less than useless. In fact they are without a doubt the biggest POS equipment in the entire game. There are many ways you could make them better and more useful allowing a variety of gameplay mechanics to be better expressed.
Unfortunately right now they are so utterly useless there is no point in using them whatsoever. I hope someone from the development team sees this and brings it up in a meeting.
