The construction really does seem to have a lot to do with the ping as well.
My Bigfoot Pings quite a bit, and it's something to get used to, my F122 even on it's feet will ping a bit, but it's metal backplace seems to annihilate nearly all the ping from smaller keys, but not from the larger keys, such as backspace. (It's really obvious when I listen for it when I'm typing, as I'm typing on it now.)
I'm sure someone could devise a buckling spring instrument by experimenting with different materials for a plate, at different thicknesses, and different volumes of air within a case, which now kind of reminds me of those musical floppy drives.