Well, you are right in the part that it is not the big deal at the moment, but take into account that it's a Russian guy doing all of it on his own (at least from what I know). And he is still progressing on the mod. The first installment for the mod was in 2012. He posted the introduction of the Nui Rama into the mod in late 2016.
And also, what was that about Fallout Equestria? I don't know the topic.