I have to say that this post was well written, I enjoyed reading it.
So far, it seems the car is solid, the issue here is incompetent mechanics who cannot fix the issue, they are simply patching the problem. An alignment is not a fix for issues like these, most people believe if the car is not driving properly, do an alignment. If you request an alignment, that is what you are going to get. I would get either the steering replaced or take it to a dealership that actually knows what they are doing.
My car has been solid from day one, I recently updated the MFT to 3.5.1 and it has been excellent.
2012 Focus Titanium Black Manual