We also have to remember that handheld-mode just has less GPU compute in general (about half as much.)
Handheld mode and docked mode work so well because the resources are about half in handheld mode what they are in docked mode. So ostensibly you could halve the internal resolution (as this scales linearly, more or less), and be able to run games at the same or similar settings and framerate. If From Software did that, then the game probably would have run fine.
If they haven't, they might even still do that, since the game doesn't even have a release date, and it is as simple as changing a config and performance testing.
But something tells me that they are lazily using their poor DRS implementation to try to manage the internal resolutions.
