This way a user can just click, start seeing content and what Lemmy is about, and if they want to comment etc. they will be asked to create an account with lemm.ee selected as a default.
This should fix most of the onboarding UX issues, and eliminate the decision fatigue of trying to figure out which instance is best.
I like this a lot. Using lemm.ee isn't mandatory, as you can choose "pick another server" the moment you try to comment. For a moment I was wary that this would just send everyone to 1 instance.