Many 3DS games already have good assets (3d model complexity, textures...) which are hidden due to very low 3DS resolution.
All it would take to let them shine on the Switch would be a simple resolution boost, which is just changing a number in the default settings.
For example "The Great Attorney" (with english patch) emulated in native 400x240 and in higher resolutions, no texture upgrade or anything else:
This along with the fact that handheld gamers clearly don't care that much about high-end visuals means that these games will transition fine.
When the herd loses its way, the shepard must kill the bull that leads them astray.