twisted -“Plain understanding of the halacha of pas haba bekisnin means that if you eat a given quantity in a given time (kedi achilas pras) it is kvius seudah. And the plain meaning of kvias seudah is reflected in any of the above scenarios.”
It works the other way around. You don’t have to be Koveah Seudah in Pas Haba Bekisnin unless it’s a min. of 3 or 4 Beyzim, nor should you.
And the trend nowadays to wash all time -is a Kula. Better to wash on a real piece of bread, than to wash on pizza.
edited