I've been very pleasantly surprised at how open to feedback Lars, Kasper, and the gang have been with Dart. One of my big concerns joining the team was that it would be like Go which seems like a locked castle. So far, it's been much better than I expected.

Look at how C++ handled external feedback and what it became because of this.

There's kind-of a gap between accepting all external feedback (C++) and dismissing all of it (Go) don't you think?

The Go team has actually reacted to a lot of feedback. They just haven't made sweeping changes to the language willy nilly at request.