A simple idea to make power and condition viable in pve, would make at least half of the boss and mobs in raids and dungeons extremely, super mega resistant to condition. Ex: boss cleanses all conditions every 10 seconds and have at least 30-50% of – incoming condition duration. In this way you would not have to nerf classes or items to just modify enemies, forcing players to make groups with great variety of builds for dps. All would have a place in any pve content.
Sorry my bad english It’s not my native language.