Make only empowered smes blocks arcfiend powers

[Asterion0]

Agree, its an uncommon interaction but no gene should have the ability to invalidate an antagonist’s entire move set.

to be fair it's easy enough to just take someone down with a toolbox. should they really have to rely on the crutch of their own abilities when regularly killing is that easy?

Relying on the 'crutch' of your abilities is the main point of nonhuman antags in the same way traitors, nukies, and spiefs have to rely on the 'crutch' of their exclusive items. It would be equally as silly if there was a super rare QM req called 'C-saber armor' that was normal armor and completely prevented all C-saber damage!
Especially if you consider that distributing stabilized SMES human is VERY easy as geneticist, and at least some crew are going to grab it, even if it's not a lot. And as you've said, that one staffie is now on equal grounds with the Arcfiend, with the backfup of both security and a medbay not hostile to them to fallback to (which the Arcfiend especially is unlikely to have, as their 'optimal' gameplan is punching Genetics APC, and hacking medbay's vendors for mutadone)