Hm, an annoyance that didn't break the partnership?
Probably an occasional neediness. Like, I find it a little irritating to constantly be apologized to for short/late/error-filled replies, when those things aren't true. A month late? Ok, apologize. A few sentences with nothing for me to do? Ok, apologize. But a lot of times, the apologies come when they didn't post right when they said they would, or it's a few paragraphs shorter than the latest pace and I get a little irritated having to stop to console my partner and let them know, "No, I'm not going to abandon you over this." But I understand the insecurity of writing and have from time to time apologized needlessly for my own perceived shortcomings, so, it's an annoyance I'm willing to overlook and cater to, for role-play's sake.