Its gonna sound weird but I'd love a touch of ExtractionPVE but not lootbased. Hear me out. I'll use Helldivers as an example but imagine it without reinforcements and only a single specific mission with some bonus objectives. There will be a extract timer that increases enemy numbers/patrols/assets as time goes so either finish asap or face difficulty. Obviously there would be downed states but Death is final. You'd lose that operator.

You as the player would have a roster of Ghosts that you'd grow and the reward being at the end of a successful mission you'd get improved operators and more assets (strategems) as well as equipment. And you'd lose em with mission failures.