I think you are going to crazy, scientific, it's much more robust now days, I had VW 1.8 T and sold to friend with 120000 and he drove another 50,000 miles and never had problem with turbo.So with my wife driving the passat 2012 TDI I am gong to have to get a gauge so she can monitor the temp of the turbo and train her to wait to shut down the car until its turbo temp has gone down to a safe number of degrees?
Not saying she can't do that but I can see her parked at work being on time but haveing to wait in her just about new car for the turbo to cool down and ends up being 5 minutes late because her new car was going through a regeneration when she got to work.
Maybe this is why our 2012 tdi passat with 9,000 miles is in the shop now waiting for a turbo to come from overseas? Not real excited about replacing turbos on a regular basis.
I am starting to think I should have kept the old TDI's as we had virtually no trouble with them and had high miles on them when we sold them.