Regardless of any tech specifics a 5-6 year old 5400rpm Spinpoint is by no means faster then a newer 7200rpm WD Black. So the slower and much older drive gets a 5.9 and the faster drive should by contrast score a .1 or greater at the very least. But MS wants us to believe in fairy tales and help push new shiny tech we don't really need. Because they know people will pay for higher index scores as they do with system benchmark scores.
No doubt SSD has a place in the market but it's not the most cost effective storage medium for every application. The average joe has no need for SSD imho and as long as the masses keep throwing away money the prices will remain at a premium. Lest also not forget that not all SSD are created equal and performance will in fact degrade over time. Meanwhile mechanical drives tend to be at or near the same speed until they give up the ghost. So in many cases the added money for SSD might be better spent on more memory, faster processor, better motherboard and or much greater storage capacity.