Interoperability undoubtedly has advantages in the long run. But there's a delicate balance to be struck at what point in product evolution to standardize. I'm fine with standardizing on USB-C (even though the cable situation is a mess). But IMHO USB micro would have been inferior to lightning, and forcing Apple to standardize on that would have set back the industry. And imagine laptops if the EU had decided to solve the conference room projector problem by mandating VGA ports in every laptop.
I also can't help shaking the feeling that the EU is so happy regulating cell phones and internet services because they have no major players in that field left anymore. Conversely, they seem to be incapable of mandating a unified standard for grounded AC power outlets, although that would surely be equally beneficial.
