Filed under Things I Could Have Investigated Years Ago and Saved Myself Hassle, there's an assumption I'd always made about Fujifilm's Shoot without lens setting: that you need to turn it back off when using Fuji-compatible autofocus lenses.
Turns out: you don't.
Shoot without a lens?
While it literally does what it says—allows your Fuji camera to take pictures with no lens attached—it's actually with a lens that it's most useful. The setting allows us to use lenses that don't communicate with Fuji cameras: vintage lenses, lenses from other systems and X-mount lenses that are fully manual (like the Samyang/Rokinon range).
Anyway, hopefully that little tidbit is useful to anyone else similarly making their lives more difficult than they need to be.