Quote Originally Posted by micahaphone View Post

If you mean that you want to multiclass but into rogue(Assassin), then no, the rules don't work like that and it would be very clunky. For example, what would you do when you're level 12 arcane trickster, and level 5 assassin? You can't get the Uncanny Dodge feature a second time.
Rules already have precedent for that; you get nothing the second time.

I’ve considered multiclassing back into the same class as a potential house rule, specifically in the realm of another subclass since class features don’t stack. But I haven’t done any exhaustive analysis of how’d that actually turn out.