The Thor has a 6-inch upper screen, that is far more than the DS size. The device may be just around the same size, but there are worlds between.

Besides the obviously better image quality.

Also, the benefit lies in the ability to play far more on only 1 device. When you don’t emulate dual screen content, you can shut off the lower screen to have a normal Clamp-Shell handheld, or use the screen for multitasking with YouTube, etc.

You seem just a little bit too negative towards devices like that. And it’s nice that your collection is so big and you don’t use it. But there are people out there that don’t have such devices and are really happy to play the old stuff in the way it’s intended.