As weapon enchants have been removed from the game, this could be either removed, or changed to only track enchant-like buffs (rogue poisons, mainly).

Yup, pretty much. Done as of ef76b0a, though it's possible some things have changed in how enchants are handled internally and might have to be revisited if other related issues pop up.

I guess now that weapon enchants are back, it might be worth revisiting this issue.

It's a simple fix. Literally just revert the earlier commit: ec6c72c