And it would be - no choice is being removed. It's more of a "I'm not sure what all this is... I just want to join lemmy" button. But I know that perhaps that's not completely in line with the core/original culture of the Fediverse. But a lot of people have incorrect assumptions on what federation is, if indeed they know anything about it at all. This leads to decision paralysis and confusion. People overthink which instance to join, at least among the open "general" instances.
And it would need to be explicitly opt-in for each server.... I don't think BeeHaw would be open to this for example.
I was trying to edit my comment and accidentally deleted it! D'oh!
If your goal were wider adoption, having a big "sign up" button that links to a random "recommended" general instance could be best (with the url/name clearly on the button). Put a "sign up on a different instance" button next to it, and a list of instances below that.
Of course - that's IF it's your goal.
I think Mastodon does this, but just a static link to mastodon.social instead of randomly rotating it.
Edit: that's what they do on the app - but not joinmastodon.org