RTF is a global modification that replaces all towns in the game.

Understood.
I like these dwarves!)))
They are almost identical to the dark iron dwarves. You could even implement the races from Warcraft into Heroes 5, and it would be like a Warcraft version of Might and Magic.)

Unfortunately, no, I will never take on a faction with a clear concept because not everything can be adapted to Heroes 5, and in the case of Warcraft, for example, there would be a problem with the names of the cities, and the gameplay mechanics cannot always be adapted. For example, Haven must have 5 trainable units, and it is also easier to balance when there are no strict limitations.

Added 7 minutes later
Perhaps, it is psychologically easier to create a faction without a concept because you can easily implement cultists and Renaissance-era dwarves on Ashen.