As for disposing of negatives, what a bunch of idiots. Evidently they don't understand that negatives aren't like the husk of a coconut, they're an important part of film photography and can be kept for decades as an archive. Want more prints/bigger prints? Just get the folder out and find the frames.
I do not share this view. I assume it is not a matter of ignorance but of knowledge about logistics and the wish of the typical client. A client who is pleased with a CD, and would lose or scratch the negatives in some shoeboxes anyhow.