That's like a weird hidden tax.
In a network world where 1GB Ethernet randomly can handshake at 100Mbit still, getting reliably more than 3/4 of the advertised Bandwith from the Adapter seems quite harmless.
https://frame.work/marketplace/expansion-cards?search=USB-C
No they dont come free in the base config either, you have to pay a minimum of 10 for every slush port.