I'm a 593 Hunter with a decent 1.29 crucible KD and multiple Leviathan runs. I accomplish to do almost every end game activity which includes Trials and yes, I have been flawless. I still haven't finished Last Wish as I'm still in the process of learning it a bit more. I have run two encounters in Last Wish and both were completions, but sadly couldn't progress further as some people had to leave.