> AIUI it won't automatically run either

that's exactly the problem, the configure.ac file might be updated to
fix a bug, but the build might not run autoreconf to actually update the
configure file, and so the package would be built *without* including
the added fix - in fact, it might even *regress* the package if the
configure file checked in contains less fixes than the configure.ac file
from the last build (and autoreconf isn't run).

> I don't see a specific problem it would fix, nor do I see a significant 
> future 
> risk of a problem being exposed.

the [test case] section shows how this problem can manifest; and this
*actually did happen* with the bionic build, as explained in [impact]
section.

I honestly don't understand the resistance to what seems completely safe
and correct to me, nor do I understand if my [impact] and [test case]
sections are unclear, so maybe I'm missing something in @racb's logic.

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https://bugs.launchpad.net/bugs/1842947

Title:
  dpkg 1.19.0.5ubuntu2.2 build did not recreate 'configure' file, losing
  changes in 'configure.ac'

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