Earlier quoted context omitted.
This was a 737-800. The first ones entered service in 1998 and around 5000 of them have been delivered since then. Comparing this aircraft to the 737 MAX is stupid.
My take away from the whole 737 MAX incidents is that the technical shortcomings on the 737 MAX is from Boeing's gross mismanagement and too close relationship with the FAA. It was all profits over safety and regulations. Can you really guarantee that this has not affected other aircraft or their maintenance?
It is unlikely to be a design issue, that should have come out a long time ago. Having said that it is simply too early for anyone to know what happened here.