It would be nice if Emacs had a command to remove matching pairs of
things so that (with | representing point):

(|let (message "%s" "foobar"))

I could delete the parens around the let function. This should work for
other pairs too:

(let ((foobar "foobar")) (message "%s" "|foobar"))

to delete the quotes around the second "foobar"

I know there are 3rd-party packages that implement this but it seems
like this should be included with Emacs since it's such a great tool for
editing.

Alex