This talking point is technically correct but IMO vastly over emphasized.

Very few pilots have significant trouble changing manufacturers. This is way, way over-hyped.

The "Bus" is far from some high tech life changing experience that many like to pretend it is. Its old tech at this point anyway. Glass and SA is less than other fleets. Its just not that special or unique.

The other argument of a faster and easier transition when you go to the WB version is likewise mostly exaggerated hyperbole from its fanbois. I dislike VA Ave as much as anyone, but an extra 2 weeks there, at some hypothetical point in the future maybe, is simply not even a minor determining factor in what NB to bid.

As for "The 765 is going to New Hires" point, while technically true we don't know how much longer that will happen. There were only so many positions. Someone not yet hired will likely not have that choice very soon if not already.

The OP asked a lot of conflicting questions so I'm not sure how to answer.