[bob1029]

> Or is that not how fabrication capacity works?

Fabs can run multiple complex designs on the same line simultaneously by sharing common tools. For example, photolithography tools can have their reticles swapped out automatically. Obviously, there is a cost to the context switching and most designs cannot be run on the same line as others.

Ultimately, the smallest unit of fabrication capacity is probably best measured along grain of the lot/FOUP (<100 wafers).