Even there, though, there are many competing standards. My MacBook has an SD card reader, but I need an adapter to plug the microSD cards from my Raspberry Pi into it. My camera's CompactFlash cards require a USB adapter. To use the high-speed SD cards, I need to bypass the built-in SD card port and use a USB adapter, anyway.

So it turns out it's easier to just buy a multi-card adapter. My computer's built-in SD port never gets any use anymore, not even for full-size, non-UHC SD cards.