been a Porsche victim since 2008 - I’ve ordered many many Porsche’s…and watched the “track your desperation“ schedule’s closely each time…
”completed” milestones are normally accurate (but sometimes the date changes “after the fact”)
”future” milestone dates are “best effort” “good faith” estimates that are subject to wild swings - they are actually some of the best random number generators on the internet
I generally treat the dates as “ball park” “order of magnitude” estimates - they have never in my experienced been precise or useful for planning puproses.
Mine were pretty much dead on...I knew before my dealer that my Cayenne S was being delivered and the day it would arrive. Got to see it unloaded from the truck.