That really does just objectively make less sense, I don't understand that debate - you don't try and apply butter to your sandwich after layering cheese and tomato or whatever, you spread the more solid thing first.

Jam spreads thinly and is less viscous, so is much more suited to a thinly spread layer across the surface.

Clotted cream is far thicker and lends itself to a big dollop on top which keeps its shape and does not run off the sides.

Why do people still question this obviously infallible logic?

I live in Devon, so I'm compelled to agree. Cream goes first, no matter what the Cornish have to say on the matter. Although, apparently the late Queen preferred the Cornish method.