The reason why it was removed, because it was meaningless. Why?
-> The score could be edited. It was a xml file. Some manufactures or shops, could be doing this.
-> Drivers was executing special optimize code to pass the Windows Experience Index with flying colors. Intel, for example, was posting scores way higher than Nvidia and AMD med-low range dedicated graphic card a few years back, yet had a hard time playing the simplest, at a graphic level, games, let alone perfectly smooth 1080p HD video. And it didn't help that you didn't see the graphic performance test, as the graphic card drivers could simply make it so that it ignores all the benchmark calls, and returns an OK to the benchmark, essentially drawing a black screen, and getting 500fps, and get the highest score possible, fooling the benchmark software that it actually operates fine. While no one, so far, did it, it could be done, and probably was done to some extent. Another way, is to skip visual effects like Anti-aliasing, much like opening the Nvidia or AMD graphic card control panel, and set it to force a visual setting to off, regardless the game settings.
So, it arrived that the benchmark was not only meaningless, much like monitor response time, or dynamic contrast ratio, but even miss leading.