NHF – new heroes for Heroes V 3.1.

They thought so, but then the uniqueness of the factions would be lost.
It would be enough to put it in the starting skills.
Or, perhaps, specify it in the skill wheel and the percentage chance of it appearing.

Well, maybe the gimmick will be that a hero can learn a skill from another faction, but if there is no castle of that faction on the map, then he won't be able to use it? Or will its effectiveness be lower than that of a representative of that faction? Although, yes, this only works for some factions.