No, but there should be a point where you can stop and burn the boss. No one is saying to remove the adds, but there needs to be a difference between the add phases and the boss burn phases, otherwise you have broken encounters. It's not difficult if you have constant add spawns, it's just annoying and shows that the devs…
GWF are your add killers....GWF will out DPS Trickster Rogues if they're doing their jobs right....I just finished a Lair of the Mad Dragon King and out damaged two rogues by about 100k because I was destroying add spawns....