Sounds like you ran into a couple of fanbois
with badges... not an uncommon situation, I'm sorry to tell you. There is nothing wrong with the cartridges they mentioned and the .40's powerband can cover anything from light 38. Special to low-end .357 and 45 ACP.
It is one a a very few government programs that actually resulted in something good.
The .40 S&W: Your Tax Dollars at Work!
“Nine-tenths of tactics are certain, and taught in books: but the irrational tenth is like the kingfisher flashing across the pool, and that is the test of generals. It can only be ensured by instinct, sharpened by thought practicing the stroke so often that at the crisis it is as natural as a reflex.” ~ T. E. Lawrence