The other issue he ran into was that he hadn't found any more Realm Fractures, sneaky or otherwise. This somewhat derailed his plan of cultivating along the way, but thinking about it Di Tou felt like it made sense.
Although Realm Fractures were a large ongoing problem, they had been a large ongoing problem for a very long time, and Mu Di Bai was still around dealing with them. Also, it was a problem on the scale of the world! Not just a small region.
For Mu Di Bai who would go around sealing the fractures, he could leave some less troublesome fractures for years or decades without much trouble, so it was clear that although it was a large problem, the scale of time it operated on was also large.