I am quite fine and happy with the Fragmentation launcher as it is. The simple fact that it retains a main weapon damage profile while being capable of hitting multiple targets is more than enough to ultimately justify the tag, as unlike the mortar, the Fragmentation launcher has free and easy access to accuracy via the Vanguard talent, making its drawback effectively nonexistent.
I also will not make the heavy nexus accurate, as it already has competitive range and Damage for a heavy weapon while lacking any kind of drawback, and Smart still effectively deals with many dangerous npc's with lower e-defense, like most striker npcs, as well as provide diversity in attacking options. making it accurate would necessitate drastically cutting back the Heavy nexus's potential, and it has enough synergy with Centimane as a talent by virtue of being a nexus weapon with no limiters or drawbacks that is freely available.