what I usually say to speakers is a rough title and 3-4 bullet points of what you want to cover as a start-I think why it's challenging is folks try to "sell" the talk from the get go, rather than refine the focus, then worry about selling it
here you are trying to be actually helpful and I've just gone and set up a new parody twitter account @wtf_oauth
Noticed that the resource owner password and implicit grants are removed from the 2.1 (For obvious reasons :))
But doesn't that make the OAuth 2.1 framework backward incompatible with OAuth 2.0?
OAuth 2.1 kind of gives the feeling its a slight(minor) change from OAuth 2.0
Password and Implicit are already not part of OAuth 2.0 as described by the Security Best Current Practice. The 2.1 update is leaving them out so that you don't have to first learn about them and then read another doc telling you not to use them.