Frontlines only needed two changes ;

Buff Tanks (Its good now at least they can dive and survive more than 5 seconds without their ults)
Rework Purify or add Fetter Wards to Melee jobs (except tanks) Melee jobs couldn't play because they get chain CC over and over and over specially when stacking SMN's exists ;

SMN1 Uses Mountain Buster
Melee Jobs in field = 3 seconds bind and slow.
Everyone uses Purify.
SMN2 Uses Mountain Buster
Melee jobs in field = 3 seconds bind and slow again, can't do nothing
SMN3 Uses Mountain Buster
Melee jobs in field = 3 seconds bind and slow again, can't do nothing purify still in on CD.
SMN4 Uses Mountain Buster
Melee jobs in field = at this point they get melted or they lost all theirs CD trying to do something.
Raise and repeat.