What's the deal with Dash Charging?

I see it uses USB-C but I don't understand the difference between Dash Charging and just regular fast charging over USB-C. It feels like unnecessary confusion.

Even after Googling I'm left wondering what the difference is beyond patents - as a user why do I care about this what method it uses to charge quickly?

Just charge quickly, and do it with any (specs compliant) USB-C cable if it can be negotiated with the power brick.

This is an interesting option for a phone despite that though, I'll have to find a colleague or friend who has it to checkout the OS and inspect for bloatware but this looks promising.