Having USB-C PD on a Shaver would be nice, but also costly as it would require the Shaver to 'ask' the power supply for power. And they probably gonna save a penny there.
Also, copper cables capable of transmitting high data rates aren't easily manufactured either. Think of shielding, twisted pairs of wires, etc. And they don't even contain a lot of copper.
I cycle to work from time to time, even tough I own a (manual) car.
It takes longer to go by bike, I get sweaty, it might rain in the afternoon but I still take the bike over the car. Because it’s fun. (Even more then driving a manual.)
Ever wondered why ${insert_proprietary_software_here} takes so long to boot?