Not sure I ever understood the point of these ywn coffee room piskei halacha. Yes there is a din mefuarsh in chazal of a moser, and yes it’s brought in shulchan aruch. There are some cases one would be allowed, or even obligated to be moser, see shulchan aruch and poskim. If someone wants to know specific gedarim for specific scenarios, they should speak to their rov, and not do anything bc of something they read in the YWN coffee room.