To throw in with the interested parties, I’m now an iPhone-only user who writes long articles and books with the Apple BT KB. Switching back and forth among iA Writer, Ulysses, and Drafts, I’ve just returned to Drafts because I’ve realized the best approach to choosing apps is parity for the iPhone.
The worst difference of all between iOS and iPadOS is CMD-tab does not work on the phone. The ability to search references from the keyboard bar limits that frustration.
(Now if only I could remember how to do everything in Drafts. Wonder if a Take Control manual would sell. I should write one.)