Very true. The cutting will retain all the genetic info in the DNA of its cells. Plants are totipotent, and cells can differentiate and dedifferentiate into various cell types. The DNA in each cell however is the same, it’s what is expressed and when that makes the morphological changes. So if your strain looks weird after 10 generations, it hasn’t lost the original info that is there, something in the environment (stress, nute burn, root rot, etc) is causing the plant to express different proteins / activate or suppress different genes.