It's quite simple. Last word is in the game now, so is jotunn, and arbalest. There are numerous ways to counter nf/luna's howl. It has an optimal range. If you're outside of its range, I guarantee it'll lose to blast furnace or a bygones. If you nerf Not forgotten and luna's howl, then you need to at least nerf Jotunn. Because that thing oneshots at sniper rifle ranges.
You can't make your game this unbalanced and then punish the hardcore players who ground through hell for such a gun. This could very likely end your playerbase. It pisses on all the blood sweat and tears many players suffered through in order to achieve ultimate victory. Can you not see that the hardcore players are the only ones left of your playerbase? Check destinytracker. There's a reason that number keeps dropping.
The only map where lh/nf is a real serious problem, is gamblers ruin. And that's because it's just a shit map.
If you nerf Nf/Luna you're just going to have everyone using the last word, arbalest or jotunn, let's be completely honest. Jotunn is much harder to counter than Nf/Lh. Think about it.
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Jotuun is harder to counter than Luna/Not Forgotten? Jotuun is pretty trash unless you're not paying attention or have the reflexes of a newborn.