I have quite a few people on my friend list by now; some for dungeon runs, some for RP, etc. I keep setting nicknames so I can remember who’s who and how we know each other, and my lovely friend list keeps forgetting / resetting them.
(If I’d be able to create lists within the friend list I wouldn’t have to rely on the nickname feature, but this is the only tool we have available, so this is really inconvenient.)