Dedicated mortar teams are something I have seen significantly less since v1.3 came out, and it is not hard to see why if you look closely. A series of nerfs done to things necessary to operate it properly have been the main issues.
Firstly, the commander & squad leaders:
Before v1.3 you had a commander every so often doing UAV. Of course, it was OP, so it had fuel added in v1.3. But with this addition came the problem of having nothing productive to do for the next twenty minutes once the fuel ran out; so the commander usually just resigns and joins inf or alt-f4s. That is if you ever even get a commander in the first place.
Squad leaders are another issue. You are lucky to receive more than one or two fire missions by the other squad leaders in a whole round. People for one rarely mark things on the map; such as a BMP sitting right on them - they don't report it to anyone else and then a full truck drives straight into it. With this lack of communication in MANY rounds across
all servers, it is hard
not to "randomly mortar" where you think there are enemies.
Secondly, the mortars:
They have always been a shitjob to get going properly. You first need to get a dedicated group of players to do mortar for the whole round as well as be an "ammo slave" that does everything from ammo to TOW, but this varies depending on how many people you have in the squad. Getting a squad going to do that role is not easy because not many people like mortar and prefer infantry.
If you get that done, you then have the problem of where to build mortar that won't get you killed within 10 minutes and is within range of enemy. Even once you have found this spot you still have to be vigilant of enemies constantly - because if one person comes up they can potentially kill you (all). To do this though, you need people manning assets around the FOB the whole round - and that is not something anyone would really enjoy; so vast majority of time there is no one guarding the FOB while mortars are operating.
Then comes the ammo problem. If you are lucky enough to get two people to do the ammo work (logi AND ammo throwing), then you have a chance of operating the mortars somewhat effectively. But like I have said, driving a logi back and forth x number of meters from the FOB, to main, and back for the whole round gets irritating for the driver. Same for the ammo thrower. But since the mortars are now limited to two per team, the ammo slaves are relieved of some work.
I understand some people don't like mortar spam, but other people don't like infantry spam either. Mortars are
extremely easy to locate. All it takes is five minutes in the UAV and you send a guy or two there and they're down. Nerfing the ammo is only going to make them more useless than they can effectively be in a normal match right now.