I'm not saying they're pipe dreams. I'm saying things go wrong sometimes. How many companies have never missed a deadline? I'm not even saying that to be argumentative - I am genuinely curious.
It sounds like you're still not taking seriously the fact that 5nm isn't just planned, but already well into the execution phase. It's far enough along that the worst case scenario at this point would be for TSMC's 5nm to be much more usable than Intel's first attempt at 10nm. The horizon for really serious unforeseeable problems is well past 5nm already.
