E-O-M: The Poskim say there is no Chiyuv of a Kli (Rav Ovadiah’s son has a fairly long bit on this in the Yalkut Yosef) and it’s an incredible (possibly nonexistent) minority who says you do. Into a Kli yes just because it’s convenient to throw it out. In theory I’m Makpid to put salt on bread at all meals that I eat at home but in reality it’s not Shayach for me yet (and the Rama says that our bread has salt in it anyway). I’m not Makpid on the dipping in salt that’s brought down Al Pi Sod, if that’s what you’re asking.
RD: I read Urbach and I greatly enjoyed his work. That in no way changes what I said there.