Earlier quoted context omitted.
I’d be interested in a source for that. The 737 is an unqualified success. IIRC, at the turn of the century, one out of every three commercial flights was undertaken on a 737. (At around the same time, another third would have been DC-9 and derivatives) The 737 wasn’t particularly expensive to design or build. It shares a 41 section with the 707 and 727 for example.
Let's not get too carried away, shall we? At least the 346 people that died in the two 737-MAX crashes would probably question your "unqualified success" statement. But yes, no one can deny that the 737 has been a cash cow for Boeing (for far too long, some would say).
The 737-MAX, courtesy of Post McDonnel Douglas-Boeing merger [0], with code written by offshored 9$/h Indian coders was a complete disaster.
[0] https://www.theatlantic.com/ideas/archive/2019/11/how-boeing...