FF and Superbreak would have been fine if they kept the toughness bar value the same while continuing the HP inflation.
Other teams can clear without breaking the enemy and they were not doing more toughness damage than a FF team so it was balanced in a sense.
Inflating the toughness bar AND the HP of enemies basically killed FF and any break characters in the future because traditional DPS teams can ignore the inflated toughness bar and do damage. Break teams need to deal with the inflated toughness bar that refreshes and the inflated health bars.