These people certainly do exist, my opinion is more of just go with what your team wants, whatever the majority of the group thinks is their best strategy going forward should shape how everyone plays in that specific instance
by all means though people should put their opinions out there if people only want to heal and not dps if the party is okay with that its fine, if DPS only want to work on their 1337 parse and would rather have more wipes than winning efficiently that's fine so long as everyone is on the same page there isn't a problem if people can't agree people probably need to leave or risk being kicked.
