<Snipped quote by Kho>
I'm gonna refrain from giving you a lengthy history lessons on that misconception.
Dark Ages weren't Dark.
They were partially cloudy.
Meh, Europe under Rome and Europe after is a tale of technological, social and civilisational regression that did not begin to fade until the 12th/13th century.
Of course, other parts of the world bloomed during this period, but I speak of Europe. Dark or partially cloudy or very sunny is irrelevant, what is relevant to my point is the regression in Europe which undeniably occurred.