But if I'm physical do I need to worry about install sizes like I do on a PS4/XB1? Or does it read it all from the cart?
Physical games are read entirely from the cart, except for patches which are downloaded to an SD card if there is one inserted, or system storage as a last resort. Pretty much once you insert an SD card everything except saves will automatically go there. Most of MK's size on the Wii U was from the DLC, as this is included in the Switch version the file size taken up by a physical copy of MK8 shouldn't be anything huge.
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