I think in the case of USB-C it's not too bad just because USB-C is widely agreed to be a good connector that's already widely adopted, but there have been plenty of bad connectors in the past which in theory the EU could now be deciding consumer electronics companies are forced to use.
This also assumes USB-C is always the best option which I doubt. I'm sure there are products which given the application, size or price point might suite a different cable better. Technology also moves on and connectors change for a reason. Now we're going to be stuck with outdated hardware until EU regulators update laws. At which companies and you as the consumer will be forced to adopt that new connector regardless of your preferences.