I've seen in Warlocks that their max level spells don't reach 9th level, even though their spell list goes into 9th level spells. In the meantime, an Eldrich Knight can use the wizard spell list, but only up to level 4 spells. Obviously there are ritual spells above the class' limit, but are they able to be cast?
If a character picks up the ritual caster feat, are they limited by their class on how high they can cast a ritual spell? This is assuming that the character has access to the spell, and is able to put it into their ritual book.