The point you’ve brought up repeatedly is that it would be a bad balancing on GB’s part to put the LF in the game because it would make the game too unbalanced for Nisha players, ruining any semblance of choice.
That’s not a point I’m willing to argue, because that comes from a min-maxing state of mind. There isn’t a guarantee that Nisha players will be so negatively affected by this that it completely ruins their experience. There was gear that viewed as mandatory in BL2 (Endgame Krieg consisted of 2 shields, and you know the whole Sal and the grog argument), but that didn’t stop anyone from still enjoying those characters.
Still, I recognize that you do have an extremely valid point there. However, my counter would be how the alternative is any better from a design and balancing standpoint. To not include a piece of gear because 1 character out of 6 has 2 skills that break the weapon is a pretty bad balance choice in its own right. You may think its selfish for non-Nisha players to want the LF regardless of how it affects Nisha’s balance, but then again, why should the other five be screwed out of a great weapon because OFEOY and TS are too good?
The LF would totally break the game with Nisha, I don’t really doubt that. But when the LC can also clear a room in seconds, how much does it really matter? Nisha has so many powerful options that even if the LF was included, it would just be another rung on the ladder. It may become the premier boss killer over Jakobs shotties, but for mobbing Nisha nearly one shots almost everything. And being an automatic and a Hyperion, even with the crit bonus you’ll still waste a few bullets, and you know better than anyone that a few missed bullets add up.
So even in the worst case scenario, Nisha has a weapon that destroys the LC (like the LC does for non-glitch pistols already). At best, she has an option that becomes BiS for raiding and bosses with adds. With how much damage she puts out already, the LF doesn’t offer her anything she can’t get in spades from another source.
So is it really that bad? Would it break the balance that much? I’d argue, if anything, the concern that will invalidate all other gear would be a better case to make for Wilhelm or Athena than Nisha, since their pistols options are a bit lacking.