Hi Norm, What I said was simple, I eliminated the source of the failure by not purchasing the product. I really do not need f2.8 and screwdrive is just fine for me. The fewer sources of failure, the better. The purpose of lenses is the collection and focusing of the light. I also purchase few if any warranties with any products I acquire. They should last. Pentax tossed in the 2 year extended warranty with my K20 and for the $20 its a wonderful deal - which I took advantage of for my K5. If Pentax would offer the same coverage for lenses - I probably would participate if I had the need to purchased the lens.
One of the primary reasons I continued with Pentax into digital, was the in-body stabilization (I still have my Spotmatic from 1970). Keeps the lenses' design much simpler. I can't see having stabilization and focusing circuity/motors within a lens - that is putting way too much additional capability into a lens that is guaranteed to fail some place down the line. 5, 10, 15 years in the future, will parts still be available? I don't know. Lenses tend to be forever, so keeping them as simple and straight forward as possible, just helps to ensure that.
Pentax needs to continue to keep the screwdrive capability within their body designs. So far its been a very dependable system. Others have removed screwdrive from their entry level models, forcing you to either all manual or buying motor driven auto focus lenses. That has the same results of lack of choice.
Don't need it , don't want it, so I didn't get it....