I believe rapid iteration (and learning curve) is what made php and javascript (and delphi, anyone?) that popular. I'm happy there's another platform but they

I believe rapid iteration (and learning curve) is what made php and javascript (and delphi, anyone?) that popular. I'm happy there's another platform but they really should use some existing language with mature tools and libs. Why reinvent everything again? Unless their real intent is to lock you to their own ecosystem and then mildly steer you to using or preferring to integrate with their own products. BTW: Is dart really open? Publishing sources does not mean a thing, is Google making choices?