I don’t know about shiurim and I am usually very machir in kazeisim just to make sure I had the correct shiur and I’m sure most ppl are the same
But pesach if you only have a small matza how are you to know if it is a kazayis
What about knowing how much water to add to dilute the wine for the arba kosos assuming were talking about wine that doesn’t already have water in it from the company
Or knowing if the bubble or fold in your matza is a problem or not
I think there are much more dinim in matza and 4 kosos then in Lulav and shofar.