The reason why powdered milk doesn’t need to be chalav yisroel is that it’s presumed that only kosher milk can be turned into powder.
The trick with all chumros is to realize what’s chumra and what’s halacha. Adam told chavah not to even touch the tree, but never mentioned that it was a chumra. The nachash pushed her against the tree, she realized nothing happened, and the rest is history. (Rashi bereishis 3:3 for those who like sources)