My issue is:

If you are reading this review page, it is safe to suppose that most of your favourite bands / musicians started their career in the late 60's or early 70's. I happen to feel that the total output of "rock world" between 1965 and 1975 was quality-wise far superior to any other decade. My simple question is: WHY?

I could give dozens of band names to support my opinion, but I'll leave that to other commentators.

There is an interesting sub-title to this. I also feel that it's useless to discuss "what would he have done, if he hadn't died of drugs or something in 197?" Just name your favourite rock hero of this era, who did something remarkable after 1975!