Or, well, I guess I do know. In Legion, we were a Heroic raiding guild. In Battle for Azeroth, it was decided to push for Mythic raiding. We didn't do too badly in Uldir, going 3/8 Mythic.
But before Dazalor, our long-time guild leaders decided that we were getting too hardcore for their tastes, and stepped down. After the first couple of raids, a large chunk of our best raiders decided that we weren't going to be good enough and split off. Then another, newer, group decided our times were not right for them, and they left too.
So then the leadership and core raid team decided to go Horde, since many of them wanted to play on that faction, and transferred to a larger server, hopefully with better recruiting prospects. This happened super-fast. They announced it Saturday afternoon, and people were transferring in the evening.
I have an invitation to join them, but I'm a little unsure what to do. I've raided with several of these guys for two years now. They're good people, and I enjoy playing with them.
But I really don't want to faction-swap Coriel. I suppose I could transfer or level a Horde character, even another paladin.
The other thing is that, looking back at my tenure in this guild, I preferred it as it existed in Legion. Focused on Heroic raids, 2 nights a week. I didn't mind Mythic raiding at 3 nights a week, especially since many other people in the guild wanted to try it, and I enjoyed raiding with them. But I did like the Heroic version of the guild better.
Hmm, perhaps writing this post has made things clearer to me. I want to find a decent Alliance Heroic guild, but one with zero intention of going to Mythic. Maybe one willing to "graduate" extremely good players, and help them find a spot in a Mythic guild, but able to resist the pressure from those good players to have the guild go Mythic.