I will say that I feel as though other classes shouldn't be able to use Cleric spell scrolls at all. A difficult arcana skill check for other classes to use a wizard scroll would make sense since technically anyone can learn to be a wizard with enough dedication and study. Cleric spells however are supposed to require the backing of a god to use, aren't they? Do tell me if I'm wrong.
Well, the issue with that is there are very few spells that are ONLY spells one class can cast. There is typically a lot of overlap between classes for the majority of spells in 5e, with only a handful of spells that are actually unique to one class.
