Bootstrap mode had been effectively disabled for a long time, the site setting was default: false for at least a year. And as a setting for new sites, that essentially means that we weren’t using the feature.
It has been replaced by the admin onboarding panel:
It’s a lighter touch to nudging new admins to do some key first steps: inviting users, sharing links, starting some topics. This banner displays for the first admin on the site, can be dismissed by the little X in the top right corner.
We should have announced this change, but since it’s a feature for new installations only, it felt a little unhelpful to “announce” it to existing admins. That said, meta is not only for existing admins, and it certainly is helpful to get feedback from the community.
So, thoughts, suggestions, ideas are welcome as always. Thanks for the question!