As a composer and arranger working with different studios, I need multiple DAWs installed for compatibility. Every time I open my DAW or Gig Performer after a few days, it rescans all plugins. With around 800 installed, that happens across AU, VST, and VST3.
I hope Apple and Avid are holding meetings after this decision to help simplify the life of library/plugin makers. As an example AAX requires a complete mess to compile and test their plugins, and several AU plugins are just wrappers aroud VST that add another layer.
I really hope the next five years bring real standardization and smoother workflows.