You are creating a circle of confusion.
All of your statements are are absolutely correct.
My post "You get more depth of field with a wider focal length at the same aperature and distance to subject." Absolutely correct. It is covered in the...
It’s actually only the physical size of the aperture opening and distance from the subject that actually determines the depth of field. F number and focal length are only relevant so far as they are used to calculate physical aperture size which...