I'll be the contrarian here...When I think of career changers I flash back to my days as a young RJ captain before the hour requirement rules. We had plenty of career changers who went and threw 100K at ATP or some flight academy and were suddenly an airline pilot with 500hours a year or so later. Ill make a generalization, and say that these were some of the worst pilots I flew with.
Now days, the bar to employment is a little higher, at least with total flight time, and certainly by the time they reach the 2nd airline (major, ulcc etc etc), theyve moved on from career changer and are just another airline pilot.