Aside from a few high-end audio interfaces, most music hardware - including licensing dongles - is USB-A.
Of course you can buy the inevitable wart-on-a-cable adaptor from Apple. But it's both fragile and ugly, and when you have an iLok with thousands of dollars of software on it, you really don't want fragile.
Edit: to be fair, some of these licensing schemes are moving to cloud licensing. But that has issues of its own - and not all are.
As for high end audio interfaces, replacing the included USB-A cable with a USB-C cable seems a trivial matter. And sooner or later they'll be included in the box.
Sure, sometimes they need to plug in a dongle and will need an adapter until USB C dongles become commonplace but that is hardly an issue at all.
Ok. I don't work in pro audio. So that doesn't mean much to me.
That is like saying everyone is using floppy disks, why did Apple remove floppy disk drive. You will need to use dongle for a while but everyone moving to USB C/wireless is a good thing.
I am sure Apple must have thought of that before pulling the plug on USB A. The point is this is classic Apple move to let go old tech and embrace new.
What do you use it for, is it something dropbox or others cannot do?
And yes, I could use USB-C.
I don't think I've used, or seen anyone else use, a USB stick in about a decade. We can't just keep these legacy ports around forever, cluttering up our devices.