Some clarification on the leadership:
I am mostly in charge of things after parsing. I am not very interested in the syntax itself but I see some technical merits from the new parser:
It is hand written which gives us flexibility to improve the error message
It has zero dependencies, so it is really easy to embed into bucklescript itself and delivers better performance. The integration of refmt used to be a headache that I gave up and called it from an external processor and the sync up relies on community contribution – with the new parser I would be happy to do the sync up work.