It's a desktop with four 10Gbps USB ports, two of which support 40Gbps Thunderbolt. Plug in an adapter and forget about it behind your computer. An adapter will probably cost less than the $99 charge on the Mini anyway.
I agree that with a minimal change for this then not something apple interested in. I would suspect that possibly add as option when do a real new iMac as opposed to spec bump. They didn’t even introduce the T2 chip with this iMac so really was minimal change.