As to why the millennials have not made quality metal:
This is a complex issue. The answer is not as simple as "millennials are turds."
Millennials, like Baby Boomers, grew up in a huge boom... in this case the dot-com debacle. They then turned to liberalism, having no other targets.
They never saw a world before total media immersion... the thought of people being only able to afford a black and white TV, and thus only having that, is alien to them.
They grew up in a time of easy money (fast loans) and expenditure on personal goods before worrying about essentials. A time of welfare, of bailouts, of make-work easy jobs (both union and not).
The type of epic conflict that 1970s, 1980s and 1990s music saw may be alien to them.
Last days of the new $oviet Republic...