Nah, FMA takes this with ease. Barriers block both ways. If a barrier is up then Father and HH can easily make a transmutation circle around HW to bust it down or collapse the ground beneath them if not just transmute everyone in. the grounds. To be fair, the worst thing HW can do is prepare the barrier, they have to go on the offensive because FMA has much better "prep feats". Since we are bloodlusted, human and soul transmutation is possible by everyone on the FMA team.
The only way HW wins is by going offensive and by numbers but most of the weaklings are dead in a flash. FMA has much better feats in the manga than HW crew has in the books. To make it clear of the power difference, death is the most powerful force in HP and can only be outsmarted. In FMA, it's just an annoyance to some and others would welcome it.