I mean, you can create two accounts. I have my Beehaw account as well as my startrek.website account, for example. I use them both for different things, and they both have different vibes. I quite like it tbh.
I agree, at first my knee-jerk reaction was against defederation, but I think actually this is one of the cool things about Lemmy and the way it works; you can have relatively isolated pockets and very open spaces, and users can move between them freely. It's not like leaving Reddit and coming to Lemmy, for example. You can use Beehaw and other instances, and both can serve a specific purpose. I really appreciate this write up because without it I would not have felt good about this decision, but after having read it I get it and I appreciate it.