Do you disagree with hardcore punk influence as being one of the key disambiguation between thrash from speed metal? Personally at least that's what I feel. I do understand this means for example a lot of Metallica won't count as thrash but I like to say if you slow down Metallica it sounds more like Black Sabbath while slowed down Slayer or Anthrax sounds quite different, so I feel there may be a hard physical evidence for my theory. I found it a bit odd you didn't have this aspect written in the statements about differences between speed metal and thrash metal.

I do like and agree that you put Slayer - Necrophiliac under the development of death metal. Though by those same accounts I'd have moved Kreator - Ripping Corpse from the thrash column to the death metal column, but that's just a personal line.

I also feel your tech death is biased too much toward 2000s rather than stuff like Sadus, Demilich or Disciples of Power.

Absolutely loved the inclusion of death n roll, one of my favorite substyles.