I'll put it to you this way - it's different with every FC.
Just like you'll run into some PvE FCs who take it very personally when you decide to leave, you'll run into some RP FCs that take it very personally when you decide to leave - whether it's do to IC things or OOC things.
So do your best to maintain good relations with your previous FC if that is possible, but don't be surprised if it's not, and don't take it to heart. Â You have to do what's best for you in real life, not what's best for your character in magical pretendy-fun times time.
Just like you'll run into some PvE FCs who take it very personally when you decide to leave, you'll run into some RP FCs that take it very personally when you decide to leave - whether it's do to IC things or OOC things.
So do your best to maintain good relations with your previous FC if that is possible, but don't be surprised if it's not, and don't take it to heart. Â You have to do what's best for you in real life, not what's best for your character in magical pretendy-fun times time.