I don't think it is actually in production yet but there is the ability to hide the "empty" workspaces - I think this means the non Power BI ones. This is what is on the roadmap (again, I don't think it is there yet).
"Allowing Power BI Admins to hide empty classic workspaces
Many classic workspaces that are empty because they were created automatically when an Office 365 group was created. We will introduce a new Power BI tenant setting allowing Power BI Admins to hide these empty classic workspaces and to delete them. We expect this capability to release by October 2020. "
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