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i totally hear you. for me it's cost benefit analysis: consequence vs cost to implement. if a shock abosorber wears out before you replace it no biggie. cost to replace - quite high, with alignment, etc., included. consequence of driving with a bad shock? nada. what does porsche tell you? periodcially inspect your shocks. makes sense to wait.
if a chain ramp fails completely, you should get a cel telling you about crazy cam deviation before your engine fails. cost to replace - quite high. consequence? in a perfect world, just a cel. what does porsche say? bring your car to a mechanic if you get a cel. makes sense to wait, but now there is a bit of potential drama, as the ramps are impossible to inspect and porsche didn't anticipate them to fail like they are failing. me, i'll wait and take the chance.
if a water pump grenades plastic into your engine it could easily die with no indicator beforehand. consequences? $15k at a dealer. cost to address beforehand - $200. what does porsche tell you to do? periodically inspect your water pump. will a water pump inspection show you the condition of the impeller? no. if you remove it to inspect it, does it make sense to put a used $200 part back in? not to me. so, makes sense to me to replace it on a periodic basis.
fear mongering? perhaps, but from experience i have seen the pieces of chain ramp in my oil filter and know that porsche did not use lifetime plastic parts in these engines. i do have an indicator for failing chain ramp (cel, oil filter contents) so i'm not about to spend the $6k to open my engine. I have no indicator of the state of my water pump impeller, and it's only $200 and an afternoon, so i replace.
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