I don’t know why you are dismissing out of hand something which some serious talmidei chachomim hold to be a problem.
I’m not. I just don’t understand why people would think the inspection has gotten worse acc. to Rav Moshe tz”l in more recent years.
Rav Moshe said we needed inspectors by the dairies. There still is. The FDA does not need to know where the milk came from, it just needs to make sure no non-kosher milk is added in. This has not changed.
What has changed, is that the farms are generally not connected to the dairies anymore. But instead there are now state inspectors directly at the farms.
If you can give me a reason how the situation is worse than before, fine. Just quoting Rabbanim saying to be machmir, when it could be bec. of a myriad of different issues why they could say to be machmir (DA cows, the widespread available cholov yisrael, added ingredients such as vitamins) does not prove that inspection is worse than before.