That's a really uninformed statement.

Firstly, art assets are among the most time consuming (and expensive) components of making a video game. This "window dressing and useless eye candy" is something a cheap, uncaring dev company would not bother continuing to refine in order to save money.

Secondly, the people who do the art and the people who do the code are not the same people. Obviously, Blizz needs to have BOTH on staff. What one group does has nothing to do with what the other group does or does not get done.

And Lastly, it is a pretty solid fact that alot of the player base LIKES the window dressing and useless eye candy. One need only look at how quickly people stampede to get it when it's introduced into the game.

If you have issues with blizzard providing the player base with things they enjoy while also keeping ALL of their employees occupied on improving the game, I suggest you find another game to play. There's plenty out there with developers who are for less interested in either.