Hello ChapmanBryan and LowellP I think there is two parts to your all admin being Global Admins issue.
1. )There is a lack of role granularity for Partners since they cannot leverage all of the AAD roles, I mentioned this in a previous response. It would be premature to make an announcement, but I can confirm we are working to solve this. It is an effort being undertaken by a variety of teams to collectively solve this problem.
2. ) For the second piece around being able to manage a scope of objects within the tenant, to me that sounds like you are wanting admin unit like experiences, please correct me if I am mistaken. I am also responsible for RBAC management in the Microsoft 365 Admin Center as well, so I will investigate this to see when it would be feasible.
Thank you for the very constructive and actionable feedback!
As for the comment around is this different than the partner center. While there is a small amount of overlap, this experience, as well as the features we are working on in the coming months, are all aimed at giving partner and multi-tenant administrators an efficient way to do all of the things they come to the Microsoft 365 admin center for. I encourage you to watch the embedded video in this article that discusses the roadmap.