Like the original iMac eliminating SCSI, DIN-8 serial and ADB for USB-A, the point of removing old ports is to ensure support for the new ones. Local pain, long term gain. (Uh, once they sort out the many flavors using the USB-C form factor.)

All of those ports were already on the decline because their replacements already existed and were better. Every one of those ports existed on a machine with its replacement at some point.

Apple never made a machine with both USB-C and USB-A. They never allowed for a transition.

Because of that, people aren’t moving forward because they are holding back upgrades.

OP never heard of a USB hub

I’ve never seen a USB-C hub that works consistently.