Upon generating a new Rails 8 app:

rails new aademo
cd aademo
bundle add devise
bundle add activeadmin  --version "4.0.0.beta14"
rails g active_admin:install User

the file app/assets/stylesheets/active_admin.scss is generated, as also stated here, despite the lack of SASS support in this new app.

I understand that the v3 → v4 upgrade guide addresses the css management strategy, but from the perspective of a new user, this is puzzling.