[nordsieck]

The issue that you seem to be skirting around but not mentioning is, the chance a chip has a defect increases with die area since defects are randomly distributed across the surface of the wafer. Chiplets are a way for manufacturers to practically increase die area while keeping yields high.

[hedgehog]

In case it's not obvious the implication is that cost per good part starts to go up quickly. The wafer size and cost is essentially fixed so bigger dies mean both a lower % of parts are good and also fewer fit on the wafer in the first place. Wrong kind of hockey stick chart.