Earlier quoted context omitted.
“Full Stop” is always a good argument. I have a USB-C card reader which I guarantee you is faster than the one you have. Sure, internal card readers were nice. But they’re gone from Apple now. Really not sure why people keep talking about this.
Show me the SD card that can saturate USB 3 or USB C. The fastest sony cards top out at about 300Mbps. Heck, USB 2 could handle that at top speed (theoretically; most implementations stunk). USB C is better with really high bandwidth things like eGPU, 4k displays, etc., but sd cards are not the best argument to make here.
It often used to be the case that internal SD card readers are USB2, even when the device has an USB3 port.