Objects, even if it trees and plants are a way of hiding bad terrain.
^^This is my favorite way to accept/deny the difficult nature of Terragen. But when you say "sculpt" I just cringe. Because Terragen as it is, means sculpting with nodes. Though that would not be a problem if there were not so few nodes built in, requiring everyone to build gigantic node networks just to get one dirt shader TG2 should have come with.
If you spend 2 days building a network for one shader, in this example dirt, then there is not a lot of time to "sculpt" anything else.
Of course, this is a post that agrees with you. But I feel complete empathy with those who can successfully hide a bad terrain.