Adaptive subdivision is just a trick that subdivides objects more if they are closer to the camera and less if they are farther away. Poser would have to do that itself. There's no reason in principle they couldn't do that (as a shortcut, it could even be a per-object setting just like the current subdivision is). They are already doing subdivision during renders. It's just a question of how to allocate development time. Personally, I would like to see it, but I would rate it lower on the priority list than fixing Superfly previews (e.g. by using Eevee for previews)