Does your USB-C port support Thunderbolt or not? What kind, which is important because later Thunderbolt can carry a lot of voltage... I think it's on the new Mac mini the thunderbolt USB-C are all on the back, but none on the front (even though there is USB-C on the front).
In theory it's a better world I guess when all connectors are just USB-C. In reality for users though, it sure seems prone to issues.
There is already one known case of revision - for a bit some Macbook Pros charged only over a USB-C port. But they (WISLEY) reverted back to the beloved MagSafe connector for primary power supply, even though I believe you can still charge via USB-C....
I guess maybe a higher end data connection like Thunderbolt over USB-C still makes some sense as probably anyone actually needing Thunderbolt will know what they are doing... but I am 100% sure mistakes will be made and some consumers will be getting a fraction of the data speed they could have from port confusion.