The idea here is to give you a solid starting point for building websites. Right now, the theme is in "functional" state - consider this a beta release.
The famous HTML5 Reset toolkit is included here - I maintain the WordPress version and thought it would be a nice addition. ResponSimple has been "normalizing" browser styles since day one, but this was a theme for people who wanted to start with a blank canvas, so a reset makes more sense.
Take some time to examine the code and contribute fixes/ideas/etc. This may also becoming a Squarespace developer template in the future...stay tuned!