Yes it is. Given that their team is top notch and their intent has been great so far, I will go with "it's a freaking hard problem and google could afford spending millions of dollars to solve it" kind of explanation.
Another reason could be that Google
optimizes both sides of the Chrome/Google webapp interaction but doesn't care very much about optimizing for any other browser than Chrome.
Once you realize that not being evil isn't a priority at Google anymore this explanation actually makes some sense.
