That's because most pug healers are bad / lazy
Most pugs are bad and lazy period. The problem still rests on the fact that I am upset at people taking decisions for me (IE pulling shit onto me). It's not like I have never speed ran before, it's not like I don't still do it when asked to or encouraged to and it's not like I won't start picking up the pace after I have judged the DPS to be in a hurry or have enough DPS / brains to perform. But just as much as I wouldn't impose my slow runs on those who asks, I would love if those people wouldn't assume I want and will speed run simply because I'm wielding a Nexus.