You can't actually use your followers and following list from X on other sites. With Bluesky, you can move your profile onto other infrastructure, continue to see posts from people you follow, and make new posts that your followers still see like nothing happened. It's like how if you own your own domain name, you can set your MX records to whatever email service you want and change it when you want without affecting anyone you're having email conversations with.

Ah, I see. Your use of the term "export" made me misunderstand. Though now that I've thought about it for a few minutes, I'm not sure what verb makes sense [to me] there. I guess "migrate?"

edit: also, thanks for clarifying!