shell-command-on-region not going to give me output in same buffer

[Dan Jacobson]

Lets discuss the command ESC | (shell-command-on-region).

   Execute string COMMAND in inferior shell with region as input.
   Normally display output (if any) in temp buffer `*Shell Command Output*';
   Prefix arg means replace the region with it.  Return the exit code of
   COMMAND.

If I want the output in the current buffer, I must accept the
sacrifice of my original input.  How destructive.  Why can't it also
be like

   C-x C-e runs the command eval-last-sexp ...
   Evaluate sexp before point; print value in minibuffer.
   With argument, print output into current buffer.

Indeed both commands would ideally have both output options, ideally
controlled by the same argument values.
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