Massive seems to know something is wrong with skill mods as they’ve already made changes to them previously and may continue to do so.
It’s not the only answer, perhaps, but the current system is untenable and a rare miss from The Division 2 on every level. That would clear out probably 40% of most inventory and vault space on its own with a new, more streamlined mod system in place. One idea being passed around is that the game should go back to the old system of skill power simply flatly increasing your skill damage, while the mod system could remove skill power requirements and instead have universal, weapon-like mods that do other things like increase duration or charges or what have you.
It reminds me a bit of Destiny’s horribly convoluted shader system that is nothing but clutter layered over inaccessibility. The result is that your inventory and your storage all get filled up with these mods you don’t know what to do with. I may not use pulse right now, but what if it gets buffed in a later patch? Then I’ll sure regret scrapping that huge pile of pulse mods. You never want to throw anything away because you never know when you’re going to need it for a specific build with a specific amount of skill power using specific skills.