Curators usually are also trying to 'create' some kind of narrative bringing together peoples' works, or many works by the same creator.

Yep, at least for some period of time, like an exhibition.

on circumcising blue whales if your expertise is in the physics of hydronic heating.

I am unfortunately a subject matter expert on both...

(sorry for the Aussie cricket reference)...

"Never apologize" - Ian Healey