There has been a fairly long running thread re the Block Manager located at https://discourse.mcneel.com/t/v6-making-a-better-block-manager/20480.
That thread had grown quiet and I see little, if any change in the block manager in the latest V6 WIP. And it seems reasonable to suspect that V6 may be approaching a launch date this year. Which leads me to think that the production team is focusing on ironing out bugs in existing features.
As someone who works with large assemblies from other CAD packages that import as nested blocks, I can’t overemphasize how much the revisions suggested in this multi year thread are valid and needed. Is there any plan to address these needs in this version release? Are there any plugins (aside from block commander) that do a great job of displaying and managing hierarchical data structures in Rhino files?