I hope people can work past preference and preferred play style to think about this.
Fusions DO NOT ship with the perk Opening Shot let alone under pressure+opening shot. For obvious and good reasons. That is why Closing Time does not belong on fusions & is allowing Zealots Reward and VS Gravitic Arrest to perform way out of band.
Its great to have variety in perk choices and not just to be forced onto one path, so to that end Closing Time is a great addition to the game for EVERY OTHER weapon but not fusions.
If none of that jived with you maybe look at it like this. By replacing Closing Time with Opening Shot it would be a effective nerf to the fusion arch-type.
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They nerfed the fk out of under pressure so they could stack these perk to bring it back to get players artificially excited. Players have to run both perks just to get basically they had a year ago before the nerf all while loosing a perk.