Haxe seems to be much more conservative in development. Haze is aquiring arrow functions but I think there was quite a degree of initial resistance to the notion. I proposed a change to allow the new Javascript style consice object literals (simply allowing {fish,cheese} instead of {fish:fish,cheese:cheese} but was shut down with a 'we don't like it'
I would prefer to use a independent language over one developed by a megacorp, but I fear Haxe will fall behind TypeScript due to their resistance to change.
My own personal experience has motivate me to move to something else. The proposal I mentioned above left somewhat of a bad taste. The process went contrary to the processes listed. Notably The proposer is supposed to call a vote after discussion had concluded. Instead it was just shut down with a "we had a meeting and decided against it". I could give no counterargument because there was no argument to counter. I'm not against languages having a dictatorial model for development, but having a facade of an open process that carries no weight seems wrong.