I really like your post as a whole, I'm just providing a bit of insight into the whole "DPS players that parse high are greedy selfish toxic people that hinder their party" stigma.
I'm 99% certain that it comes from people that have never actually set foot in savage, and don't have a proper frame of reference for just how punishing, or damaging these mechanics actually are. DPS players in, say, Swallow's Compass are able to stand in orange circles for more damage because they take like... 25% of their HP as a punishment and nothing more. Ergo, people see that and think "Oh there goes that greedy DPS player again, making MY LIFE HARDER FOR THEIR TOXIC DAMAGES!" The first boss in Hell's Lid is actually a perfect example of this. I make a game out of seeing how many vuln stacks I can collect because the damage that swing does is so laughable, yet it's still ultimately a mechanic that's ignored for the sake of my deepz.
They fail to really properly grasp how bad it is to mess up a mechanic in Savage, where one misstep is very liable to kill either you, or another party member.