Most Pugs actually base their choices off of Warcraftlogs and optimal raid setups…AKA most pugs wanted a Boomkin or Meta Lock for Gnomer (Last boss bombs). They also ask for Ranged DPS but what they really mean is LF Fire Mage, Destro Lock, Spriest, Ele Shaman…basically any Ranged dps but Ranged Hunter and Frost Mage.
I don’t blame them either, they want a smooth run I guess.