So I ran into a PCA member yesterday who's a long time 30+ year track enthusiast and who's adult son is a Porsche club racer / instructor. His response on buying a PEC car was "only at a huge discount". NOT broken in for 1,500+ miles, and 8k miles at PEC is equivalent to at least 50k+ miles of regular street driving including a few track days and auto crosses.
As for the CPO warranty, he said that is unusual to be offered, but to consider that Porsche won't cover something until it is actually broken, and will not cover "wear" items. So for example cars equipped with PCCB's in particular, are very likely (50%+) to have an eventual replacement that will run into 5 figures, whereas 90% of non-PEC cars ordered with ceramic brakes never need rotor replacement. That was just one example. This PCA member had a Cayman R that he would track 30+ days a year, and did almost all of his own maintenance.
Don't shoot me as the messenger. I'm just repeated what he said, but I trust the source.
Good luck whatever you decide.