Not true, any type of group build can work. In reality more DPS doesn't mean shart, when you DPS can't even effect regen of AVs or your eating dirt 24-7. At end of the day, everyone who is not a resistance build should be trying soft cap DEFENSE to S/L/R then anything else.
The 3 Rs are still Aces of the game: +Recovery, +Recharge, & -Regen. Without those, doesn't matter what you do, you ain't doing much for higher content.