Personally I think they should abandon/maintenance-mode the "manually scale the pixels to fit the screen" mode and make the "virtual pixels" mode capable of supporting DPI-aware apps.
DPI awareness is generally supposed to be the domain of the lower levels of your GUI library, so that just about everything else above that level just works, and only a very few pieces in a very few apps need to concern themselves with scaling matters. The “System (enhanced)” scaling mode in question here is really just about doing that: patching GDI (the most common lowest level) to be as DPI-aware as possible if the app doesn’t have something else taking care of it.
Nothing about Windows’ approach to DPI awareness needs to be abandoned. Your app code isn’t supposed to be DPI-aware, you’re just supposed to use a GUI library that is.
Personally I think they should abandon/maintenance-mode the "manually scale the pixels to fit the screen" mode and make the "virtual pixels" mode capable of supporting DPI-aware apps.