As much as I hate responding in threads that I'd think should be kept as dead threads, I'm going to add my two cents as I feel I've got something to add to the conversation you started that is only related to the OP by the terms "tube" and "failures".

I've had presta stems pull out of tubes too. I don't think it was the tubes fault. I think it was my hose end on the pump that took too much effort to put it on and way too much effort to pull it off. The latching mechanism on it didn't work correctly and I put up with it for years not realizing the slowly increasing effort in putting on and off until I started pulling out the stems as well. After replacing the hose and hose end, I realize how much unnecessary force I was actually subjecting the stems to as I pulled the hose off. The nut on the stem does prevent you from harming the tube/stem juncture when putting it on. So I do leave my nuts on the stem. I can see where overtightening them might be an issue for any that have threads cut all the way down them below the rim surface.

Maybe your experience is completely unrelated, but consider if it's possibly happening. As I said, I didn't realize till too late the hose end was too hard to remove compared to what it should be.