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Never ending programs are quite frecuent, just think on Apache, Sendmail, DB2, etc. There are not something very new, I remember writing NEPs in the S/34.
Apache, Sendmail and DB2 are not never-ending programs. They run until they're told to end.
For example, Apache on the iSeries ends when you type ENDTCPSVR *HTTP. A signal is sent to Apache which tells it to shut down.
Sendmail actually has several modes of operation. In one, it's a program you call from the command line, it processes one e-mail message, and then ends. In other modes of operation it remains active until it receives a signal, just like Apache does.
I think that was the point -- you never write a never-ending program, you always want to shut down when you're told to shut down by some external process. That might be a message on a data queue. It might be the subsystem ending (and therefore checking %shtdn). There are lots of other possibilities.
And, I think that was the point... you always need to be able to shut down a program.
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