@JeremyECrawford The Kensei ability "Unerring Accuracy" is the only ability in that archetype that refers to "monk weapons" instead of "kensei weapons" – is that an error or is it intended to work with all monk weapons? If the latter, what about unarmed?

— Gabriel (@NewModelKoan) November 15, 2017

Here's the problem…

Weapons of the chosen types are monk weapons for
you. (So your Kensei weapons ARE monk weapons.)

— A. Tyger (@ATyger) November 15, 2017

Kensei weapons are all monk weapons, but not all monk weapons are kensei weapons. #DnD https://t.co/pDKmOr15ms

— Jeremy Crawford (@JeremyECrawford) November 15, 2017

My point (if unclear) is that the capstone works with both specific monk weapons, and any kensei weapons chosen. It is not an exclusive or prohibitive capstone. I am not sure if that was what the OP was referring to or not. Yes, that is intentional.

— Jeremy Crawford (@JeremyECrawford) November 15, 2017