Tbh, a lot of it is content design. BA progression should have MORE positive effects on the outside aside from one annoying NM.

Clear the twins? Bunny fate drops more gold chests.
Clear Raiden? NMs drop more crystals.
Clear support fate? Temporary drop rate increase of moisture-warped lockboxes.
Clear AV? NMs spawn faster. Throw in some lore about Eureka destabilizing or something.
Clear Ozma? Extend these effects for the whole zone for 30 minutes.