In the lore of xianxia, it is actually a viable excuse. Many ancient masters end up going on journeys to see if they can get one last spark before they die. And helping out a random kid just to see what happens is quite common in those stories. If you want to see an extreme example, read Long Live Summons. A freaking creation god goes wandering and picks up the mc in that one. When he gets tired of following, he tries to rob the old man and gets punted through a portal that lands him in a xianxia world corpse. Read more

The god also sends him a pair of Phoenix eggs and a goddess in the form of a sword and gives him a body from the strongest race in that world

Better than when they are forced to use the dream master. Lol