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.
You might call the branding unnecessary confusion, but in my experience it's been a differentiating feature, one that less tech savvy people I know mention when talking about reasons to switch to a OnePlus 3. And it's not a marketing gimmick either; I've seen it work in real life, and it's speed is kind of incredible.