We have seen our organization use workspace widely. And a power user has lot many projects created. Currently workspace doesn't support any folder management and it has a plain search to find the report. And this makes it difficult to access projects in future when it is required.
It also reduces the visibility of Admin shared projects. As a result, users within org end up creating their own projects to answer their questions instead leveraging admin shared/authorized projects. Net-net, this also pulls down org efficiency