WSC,
I think that we'd need to be very careful about lowering the bar for BLPs on ENWP, because there are innumerable non-notable professionals who seem to pay people to add their biographies (and/or small organizations) to Wikipedia, and I am more happy to keep them out of the world's encyclopedia unless they've done something that's more significant than publishing an occasional scholarly article, owning a small consultancy, and receiving a few professional distinctions like "adjunct professor of cardiology at XYZ University". I'm not saying that we can't lower the bar, but we'd want to be very careful about doing so in order to avoid giving marketers and PR people a wider opening for using Wikipedia as a marketing and PR platform.
I'm very supportive of improving the user experience for aspiring contributors who use mobile devices, but I am not optimistic that this will lead to a substantial increase in the population of ENWP Wikipedians who can become proficient with the details of our many policies, are willing to persist through negative experiences with other contributors (including vandals, overzealous patrollers, POV-pushers, etc.), and volunteer their time for high profile roles like WikiProject coordinator or ENWP administrator. Perhaps non-English Wikipedias do better with editor retention; I'm also thinking that Commons might be a good place for new contributors to start if and when mobile editing becomes more user-friendly.
I think that making reversions feel less hostile would be good for diversity and good for editor retention in general, so I'd suggest that WMF prioritize working on that point. I'm also hoping to improve user onboarding with my video project and in collaboration with the WMF Growth team. I generally appreciate how Kerry is thinking about these problems; she and I have both given feedback to the WMF Growth team.
Regards,