@neville-chaim-berlin I have heard b’sheim Rav Reuven and Rav Dovid (YBCLC) Feinstein that Rav Moshe ZT”L’s psak on Chalav HaCompanies (as you put it) is that we can rely on the USDA to make the food Chalav Yisroel and it’s not a heter.
I once asked a Rebbi what the definition of “kula” and “chumra” are in regards to modern halacha. He said that it’s simply a matter of who you hold of. Like in general the klal holds one way, and for whatever reason you choose to go according to a minority opinion. Depending on whether the opinion is more machmir or more meikel that would be a kula or chumra.
Like the Chazan Ish said that the s’chach of a sukkah cannot be held in place by something that itself is pasul for s’chach. He is a very minority opinion on that matter. But if you’re in position to follow it, then kol hakovod to you for making a sukkah that’s kasher according to everyone.
Similarly, if there’s a something that everyone considers assur, but there’s reasonable minority opinions who say that it’s really allowed, then given extenuating circumstances, it may be allowed.