alt Hacker News> if I wanted to buy a device with a new type of connector, I should have been able to
You are. Nothing prevents the manufacturers to support other better charging solutions than USB-C. In fact many notebooks has their proprietary connectors and some smartphones use custom signaling over custom USB cable to provide better experience while complying with the regulation and support USB-C charging, too.
I replied to a similar question here https://news.ycombinator.com/item?id=48711705.
If I wanted to buy a device with a different type of connector, including a different form factor or a totally different charging mechanism, I should be able to do so without additional costs or additional holes drilled in the case of the device.