In 10 man heroic, except for Jin'rokh (which I don't cosider a "heroic" boss), SotF is very strong for all bosses. Incarnation has suffered a lot since 5.0: We don't need it as a mana saving CD any more, and the only fights with high damage phases where it would be good as a throughput CD are bosses with almost constant AoE damage, and SotF is just better in terms of throughput. (Examples are Megaera or IronQon). Also, as was said before, 10 mans are not designed around having an abundance of heal CDs, so it's not really needed.
While FoN is nice to compete with smart heals in low-damage fights, I find them underwhelming in fights that are challenging my healing.