i think the best way to nerf the mortar without making it usless would be still letting them restock ammo but only one shell at a time every 2-4 seconds, that why you can still have the fun of dropping bombs on objectives but once you are out you have to put some effort into restocking that would take some time, and sure you can swap to your 2nd mortar man but then he rans out too.
i also think that fact that most classes get access to a secondary weapons it rather unfair for new players and unrealistic, i have seen a number of people now running around with 2 breda models LMGs or two tompson SMG’s and it angers me so because it reminds me of call of duty and i dont like call of duty, i would think at most that snipers and engineers could have that perk while all the other classes could have their perk replaced with extra ammo.
i that in invasion game modes planes should deal some kind of debuff to friendly troops when bomb an objective, as the attack is to capture the objective not destroy it, and the defender is to defend it not destory it