Prismatic Gem has a 25% to inflict toxic (corrosive) status per tick. It takes 14 corrosive stacks to fully armor strip something with emerald shards. It means it takes ~56 hits on average on an enemy before they get fully armor stripped.
I don’t really see how is that optimal. Even if we have a weapon doing corrosive damage (which is not common since viral is meta now) reducing this time in half, it’s still over 20 hits - I want most of my enemies dead before I hit them 5 times, not 20 or 50.
Allies also shooting the target doesn’t really make it better, in the end it still results in needing lots of hits to strip - likely more than it’s required to kill.
It still sounds like this is all more due to Verglas being OP than anything to do with Citrine, if it alone accounts for instant 80% armor strip. With a companion, shards and corrosive weapon even Loki can fully armor strip then, it has nothing to do with the wf or prismatic gem.
I’m not saying it doesn’t help, each free corrosion stack when near Citrine helps a bit even if you dont equip emerald shards. In my experience though, in practice, it’s easier to just cast pillage, immediately fully strip that thrax centurion and oneshot him than depending on corrosive stacks building up. It’s just too slow.
edit: You mentioned mutlishot boltor, I dont think prismatic gem triggers off multishot otherwise shotguns would be completely busted with it. Shooting an enemy with a single shotgun blast doesn’t proc the gem a dozen times afaik, maybe it has an internal cooldown.