Why would anyone get these drivers. 21.85 was available two days ago, plus this site did a comparation between 20.80, 21.81 and 21.85 only yeterday. This all gets confusing so why would anyone get these drivers?

You will find that with the many many different configurations of hardware available these days that hardware drivers have different effects depending on the system. Some people report that the old 12.90 dets give the best performance. I have found the 20.80 dets to give the highest scores for my system, but every system is different as others will work better with the 14.10 drivers for example. So, that's why people like to try all possible versions of drivers as all systems are different.