It’s to be noted that PvE encounter balance comes from the PvP balance. I strongly believe that each and every class design in Guild Wars 2 emerged as a set of roles a player performs during fights against other players, unlike PvE oriented games, where the PvP balance is still an unachievable thing due to one-sided class design. So as for me, Guild Wars 2 champions and bosses fights are more similar to the player versus player mechanics, which implies any fighter should control, damage and kite well to win.