If disjunctions are common, one major bug needs to be addressed with disjunction. Currently disjunction removes masterful crafting / wondrous crafting, raising the items minimum level.
This in itself would not be bad, but the anti-abuse code makes your toon totally unplayable if you wear items above your level, and if the masterful crafting is disjuncted, item level rises and you're screwed. And forcing people to swap out the hard-earned wondrous crafted items just seems wrong.