@Fantasmic87 pointed out the cabins are lacking the deluxe amenities.
I replied to your quote about the missing amenities mentioning the Fitness center and a Table Service restaurant.
You are correct that Poly did not have its own fitness center but it was shared with VGF and a quick walk over but all other Deluxe/
DVC have a fitness center.
I do believe the Fitness center at WL is available for use but that does not seem convenient esp with the walking path shut down.
Deluxe/DVC also all have on site Table Service Restaurants including Boardwalk which has 3 with the Cake Bake Shop, Flying Fish and Tratoria.
I don't consider Hoop-De-Doo Revue a table service location since it is a dinner show but others may.