Trying to ask something that no one has asked yet so... we know your opinion on time travels fics but what is your opinion on crossover fics?

(me personaly, I like trying to blend the lore and world-specific rules from the different fandoms I'm trying to mix. the more different the better because it feels like a challenge and I like seeing what other people do with that too, even when it's not particularly good)

I’m generally not a fan since I’ve never seen one that really satisfied me. That said more power to the creators and fans of it.