> If you mandate that all electronic devices must have USB-C cables, how can anyone invent something better than a USB-C cable?
That already happened with Micro USB. The EU initially mandated that manufacturers agree on a standard socket, because the absolute zoo of charging ports back then was counter-productive and only generated e-waste. Ultimately they agreed to use Micro USB, but obviously that's not what's used today.
These regulations are not just dumped on the manufacturers - there's a period of consultation and a grace period to implement them. If something actually better came up, you'd eventually see it mandated.
> If something actually better came up, you'd eventually see it mandated.
While I generally am quite content with that particular mandate and it does more good than bad, I would have to disagree on this. Something better doesn't come from nowhere - hell, USB itself has gone through a long and arduous path until it came to the (messy) standard it is today. This is essentially banning any other standard to grow and be improved upon with feedback and iteration.