And if every such poll will requires a special setup (configuration by
the admins, etcetera), it will limit our ability to do them.
I don't see how all of those downsides couldn't be
mitigated, providing a GNU site or other means to
serve as single collection point, echoing point
(echoing current counts, text suggestions, etc.),
and even providing a discussion venue.
IOW, don't try to reproduce the polling here, there
and everywhere. Just announce it here, there, and
everywhere. Anyone who wants to discuss a poll
here, there, and everywhere is welcome to do so,
but that discussion will not automatically be
captured as part of the poll itself.