A funnel will tell you that fewer people reached payment than reached the basket. It will not tell you whether they left at the address book, at the card field, or after a long stare at delivery times. In the Catalogvectorhub room we still put that week on paper first.
Nino draws a line for the named flow, left to right, and ticks each person who arrived at a step. A drop-off is not a cliff. It is a cluster of ticks that stop, plus a second row for the people who came back later the same day. The second row is the part a funnel usually swallows. Grocery desks in Tbilisi see it often: someone opens the basket, goes to check a fridge, returns, and only then leaves.
Pencil helps because you can shade a pause without pretending it is a measurement to two decimal places. If the recordings show a twelve-second stall on a language picker, that stall gets a small hatch mark, not a new colour that shouts. The briefing then has something to point at. “Here. This hatch. That is the stall.”
We do not draw drop-offs for a whole product at once. A catalogue with six entry points produces six different leaving places. Name the flow, then draw. If you only have completed-order counts, wait until you can see the steps, or commission a picture that honestly says “we cannot see the pause.”