I have never been able to associate reducing selection with increasing diversity.
Sorry DJ but that just doesn't make much sense to me.
Does AH allow me to fly an F-86? Does AH allow me to fly an F-16? Does AH allow me to fly an F-22? Well, no. Is AH then limiting my selection and reducing diversity? Well....yes.
By its very nature AH is already limiting your selection and diversity by limiting your selections to a particular historical window that is CURRENTLY framed across the entire span of WWII.
Its perfectly valid for AH to limit you selection and diversity to the aircraft available within the context of the historical window they are trying to present. What ever the boundries of that frame are.
A RPS would simply be divinding a single large window into a series of smaller sequiential windows. At each frame, its still valid to limit your selection and diversity to the aircraft available within the context of the historical window they are trying to present.
They'd just be presenting a series of smaller windows instead of one big one. Its only a difference of degree, not of kind.
Btw, I don't think the planeset is filled out enough
yet for a RPS.

Regards,
Wab