Ilya Bukshteyn Regarding boss-admin/delegation, that is absolutely a capability you have in Skype for Business Online:
https://docs.microsoft.com/en-us/skypeforbusiness/set-up-skype-for-business-online/set-up-and-troubleshoot-skype-for-business-online-delegation
https://support.polycom.com/content/dam/polycom-support/products/voice/business-media-phones/user/en/vvx-business-media-phones-skype-quick-tips-5-8-0.pdf#page=2
Let's talk about Favorites for a bit, because I think that falls within the scope of any reasonable definition of "Presence Integration". On my VVX 411, I can see the status of the contacts I had added to my Favorites before I moved from Islands to Teams Only mode, but I have no way of adding or removing anyone without switching back to Islands mode and managing them in SfB. Is this a bug, or working as designed?