that Switch version is such a joke... just to really drive this home:
the Wii's GPU had a peak of 12 Gigaflops/s
the Switch's GPU a peak of 393 Gigaflops/s
The Wii runs this at 480p 30fps
the Switch runs it at 900p 30fps
The Wii loads levels in less than 5 seconds
The Switch takes often up to 15 seconds
The graphical improvements on the Switch are so minor you have to actually stop and look at the textures to see them. During movement everything is so blurred due to the speed and the low framerate that you barely see an upgrade.
The most visible changes are ones that would be possible to implement into the Wii version with barely any performance impact. These changes are the color palette and the stronger bloom effect.
So what you get in the end on Switch is a game that barely looks any better, has a pixels per second increase of less than 2x (about 1.7x) and longer loading times.
meanwhile the Switch's GPU in docked mode is about 32x as powerful as the one in the Wii, and in handheld mode about 20x as powerful... (this is not even taking into account that the GPU of the Switch is way more modern as well)
...2x pixels per second + barely any real improvements in graphics (in fact shadow draw distance is lower on Switch than on Wii) + slower loading... and all that on a console that has up to 32x more GPU power available. this is beyond ridiculous.
Colors Running on Dolphin vs Colors on PS4 Pro (closest shots I've found):
basically, BLOOOOOM and some color changes... that's basically the big difference here in this shot. now imagine on Switch at lower res and lower settings!