Oh dear. There's nothing like quoting out of context. Perhaps I'm lucky that I didn't pay myself or have a contract with myself like the OPs in those threads, so didn't have to worry about being mislead.
And perhaps, without being too modest, when you know what should be done and what could be done, you're in a different position.
And for the record, I've also used fixings which weren't corrosion resistant, and un treated timber in the garden. I'll have a look how they're doing after a few decades and report back to you for advice.