I don't see anything wrong with this. LRMs are going to have a huge advantage in indirect fire. With a good scout and spotter, they're going to be able to deliver damage from safety in a way that no other weapon can really match. That may come at the expense if being vulnerable to someone closing on you - which also feels right. So what's the answer to that? Escorts. Someone hanging back to cover the artillery and help deal with fast strikers coming through, and take out scouts trying to spot you for counterbattery fire. Or maybe just a more balanced loadout - something more like a Zeus or Orion that contributes some LRMs, but doesn't rely on them as heavily as a Catapult or Archer would.
I think it's going to be very important to judge how these things play in full matches, not theorycrafted 1v1 min-max number crunching. The devs seem to be going out of their way to encourage team tactics in the game. "I can sit here and lob LRMs at you for five minutes while you're helplessly trying to close range with me and you can't touch me" is not team, and it's just barely tactics.