When not to soft-delete: "Biographies of living people" is something I don't agree with. Unless the article is defamatory (which is an obvious problem case), these are the articles that would primarily benefit from soft-deletion. A lot of people forget to provide evidence a person is notable and quite often adding one or two sentences with a source can solve this. I would include "bio articles that are clearly notable based on a Google search, but don't show it in the article." as candidates for soft-deletion if they don't survive with a keep result. Unless a bio can be proven to be self-promotional or not notable at all, there's no advantage in not using this system.
By the way, I don't consider AFD binary, there's already more than 2 possible results (aka merging, redirect, etc). But the lack of those appearing on AFD, shows there's too many people thinking black and white. Instead of people blanket voting delete, I would love them to address why for example the merge another user suggested isn't appropriate.
Mgm