A car needs a seatbelt that passes whatever certification is required by law, but there's nothing stopping you from making it better. There are 5 point harnesses out there which are street legal, but the only people buying them are car modders who want to use their racing car on the street and managed to get the rest of the car approved already. Mainstream manufacturers have also experimented with fancier seat belts, but there was no market demand for them.

Type C is similar - the new law requires a device to have a type C port that supports at least all the basic functions. If a manufacturer wants to include their own improvements, they can either use the Type C port like everyone has been doing for years (Warp/Dash charge, QuickCharge, analog audio, thunderbolt 4...) and/or add a second connector. The only one who hasn't been taking this approach was Apple and they haven't done anything innovative with Lightning since it was introduced.