For the last 12-18 months, some of us in the core issue queue have been debating the best way to make changes/improvements to the Basis theme without breaking existing sites. There are several ideas out there, but we have yet to reach consensus on any of them.
One idea that is being currently discussed would be to add a new theme to core.
In this session, we'll have an open discussion about the future of Basis for Backdrop and whether or not it's time to add a new theme to Backdrop Core.
I would love to see boostrap5 lite in core - will make sites much easier to customize for many potential users.