I recall with the release of Roon 2.0, one of the stated capabilities was that Roon Remotes at differing versions would be able to access the Roon Core

Do you have a link or quote of that? I can’t find any such thing in the Roon 2.0 Release Notes, or I’m missing it. Neither here in the actual release notes,

nor here in the announcement,

or in the 1.8 Legacy announcement,