In most every shop I've worked in, we created some form of SYSx.NULLFILE and/or SYSx.NULLPDS. So I agree, it would be nice if z/OS supplied them. For over 30 years I thought that a DD DUMMY in a PDS concatenation should act as a empty PDS and not a EOF, but IBM did not ask me. I have never seen a practical use where the current EOF behavior was desirable (of course, I've not seen everything). I would tend to support changing the behavior. It would take an organization like SHARE to get IBM to change it, but I expect most people want IBM to work on more important features.
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