Why did they go back to the less detailed Washington bust for the 2010 release?

When I received my 2010 type coin for the new "America The Beautiful National Parks" series I noticed right away a very striking (no pun intended) difference in the obverse detail quality. Firstly, almost all of the hair detail was rounded, dull, and looked worn. Secondly, upon further inspection, I noticed the obverse bust is all-together different from the 1999-2009 States & Territories issues as is clear from the initials of the designer on the neckline (see the red ovals in the picture below).

I'm not a Washington Quarter buff, so I'm sure this isn't a revelation. I did search some of the coin blogs, and couldn't find a clear reason why this retro-design was reintroduced. Compared with the sharp, beautiful, detailed issues of 1999-2009 (see below) this 2010 change is upsetting in terms of quality. Even the old reworked bust of the mid-90s prior to the State Quarters series was very sharp and beautiful.

Can any of you Washington Quarter buffs out there explain the reasoning/thought process here?? Just curious...

Happy collecting!