There's a large number of people who tend to act out and make unwise decisions when PotD runs aren't going as fast they'd like. They're usually just inpatient, but I've ran into a few who became malicious when asked not to run off all over the place without the group. If anyone saw my posts earlier about the BRD from PotD that a tank and myself had to report, he started doing that specifically after I asked him not to run out of range while I was trying to cleanse his status effects. Which I only even bothered speaking up about because I didn't want him to think I wasn't trying to do my job as a healer.
I think everyone goes to PotD for different reasons and the speedruners would ultimately be happier if they went in with fixed parties who all want to clear the floors as fast as possible instead of automatically expecting other people to know. But that's easier said than done.