Noricum, Vortex mainly. Allow players to poke their Mechs out, fire, and be back behind cover. This trivializes weapons that need to aim. There's a time lag in aiming and firing the Noricum and Vortex just do not need. Because of this, one using Noricum and/or Vortex can send most of their time behind cover. They're safe behind cover meanwhile anything that has to aim must make themselves vulnerable to take a shot that might miss. Vortex is particular just fire, forget while they home in, bypassing the whole "aiming phase"
The dynamic on the battlefield this has created is that Vortex mainly and partially Noricum has become the easy way to get kills. "Oh, enemy is that way?"
Chuck noricum that way and back to safety. You don't even have to wait for them to finish firing. Orochi core emp wave? Oh look, vortex can DPS from the safety of cover!
Literally every other weapon must aim and fire to do damage and in doing so be vulnerable while the vortex/ is just waiting to aim. "Oh he is aiming to shoot? Have some missiles. Have some mortars"
Only other option aiming weapons have is to risk it, fire, maybe hit, and trade damage. But if the missiles do more damage...it's a trade you loose. Snipers loose this fight or are forced to stay in cover, rendering then useless. Everything else is out ranged, forcing them to rush, taking damage all the while, leaving themselves to be picked of as they approach.
Look, I don't know how you devs can/will balance this but something must be done otherwise you will have entire classes of weapon unused while most people use the "easy win" weapons. I played a guy and THREE of his six Mechs were some combination of missiles and/or artillery.
THREE OF THEM.