Free.
Not just with closing time. Don't frame it that way. I don't care about usage. You know they are free. Some people just have common decency and etiquette and don't want their wins to come from having a fusion plastered to their hand.
Make them projectile and not hitscan if you cannot always sync the sound of it charging with what's actually happening in game.
For every reason you offered for nerfing shotguns outside of usage, you ignore that on fusions.
Edit
What other special can be used exclusively as your primary other than Forerunner and Fusions? Why when it was a problem for shotties and that side arm something needed to be done, but it's fine for fusions?
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The issue with fusions that no other special weapon has is that they function as a one shot kill within the most common primary ammo engagement ranges (10-25 metres). Believing you’re about to have a primary dual and then getting one shot will never feel good. Shotgun jousting or sniper peaking is kind of accepted as a 50/50 and 2 special weapons. Fusion vs primary always feels unfair.