This is very well put.
While I've always understood the economic motivation for margin optimization and the technical reality that CPU wafers aren't very granular, fundamentally, it's a long-term losing idea to intentionally fab gates that don't add end-user value. While it may work in the shorter-term, when it becomes the plan of record (as opposed to fixing a one-gen design or product mix error) it signals a shift to prioritizing value extraction over value creation.