Many people use side projects to play with new and interesting technologies. Sure using SproutCore may make the page load slower, but this is something Tom did in his spare time and as community we should be thanking him for his contribution.
Also, I'd like to commend Tom for staying classy in the pull request and not getting into a flame war about the merits SproutCore.
Also, I'd like to commend Tom for staying classy in the pull request and not getting into a flame war about the merits SproutCore.