In all of this, I found the OP to be the most troubling post in the whole thread. The assertion that “a few cases where we’ve seen over the years” of corruption could completely discredit an entire segment of K’lal Yisrael for the issue of Kashrus is outrageous.
The premise that no similar incidents have occurred among Chassidishe Hashgachos is ignorance.
What of KAJ, Star-K, KCL, CRC, OU, Kof-K, and many more, all Litvishe Hashgachos of excellent repute?
What of the great number of local Va’adim, also Litvishe Hashgachos of top-notch quality?
You magnanimously concede that there are “some competent Litvishe Hashgachos,” but in the same breath, you dispose of them because of “a few” isolated incidents “over the years.”
For shame.