Well...

Mch - Selfish dps but it's numbers weren't adding up in EW. It was also an easy job coming into EW and SMN stole that. So damage fiends went elsewhere and easy job seekers went elsewhere and that didn't leave a lot of mch fans around.

Mnk - Viewed as too complicated and that effort isn't rewarded with higher numbers. DT may have fixed this, but frankly I think the ew mnk rework, while good, missed the mark for monk mains who are probably all off playing viper at this point and cackling at their 6 positionals and 1.5ish second gcd awakening phases.

Brd - Dnc ate their lunch.

Ast - Too hard for too little personal payoff. May recover in DT, time will tell, but EW ast was deranged.