The questionnaire you linked had me taking a cautious stance:
This is a tricky one right off the bat. My personal opinion (which I've
only really expressed in the mod chatroom and which I've been meaning to
bring up on meta) is that the community should be able to (and should)
outweigh the poster of the challenge on certain issues. Clearly if the OP
self-vandalizes the question, the community has this right—but how far does
this go?
[...]
My personal opinion? This is comparable to the first question in that it's a
question of whether the community should be able to override the original
poster of a challenge. Accordingly, my own view is similar: yes, to a certain
extent, experienced users should be able to overhaul a new user's challenge.
(The problem then becomes: to what extent? That's a discussion for meta.)
That was over a year ago, and accordingly, my opinions have changed. But before
I go any further, I'd like to make it clear that this is still my personal
opinion as a normal user of PPCG, and as a moderator I will continue to make
decisions based on community consensus rather than my views in particular.
The reason I want to make that clarification is that this viewpoint could be
somewhat contentious. While I previously said, or at least implied, that there
should be explicit limits to the extent that the community can overhaul
challenges, I now propose that all challenges be treated as collaborative
community efforts in which the original author has little to no special formal
privilege.
Already the tone of this post is starting to sound evocative of the "Stack
Exchange mission"—the idea that the purpose of Stack Exchange Q&A sites is to
build a repository of questions and their answers rather than to help their
users directly. And in the past, I might have run with that idea, but as has
made itself clear many times over, we are very much not the typical Q&A
site.
So if we're trying to intentionally distance ourselves from the idea of the
"standard" Stack Exchange site, why else do I want to retain the concept of
posts' being a collaborative effort for challenges? (Obviously I'm not arguing
that solutions to challenges should be freely editable by anyone, but one could
claim that solutions already are built collaboratively in some ways in that
comments are very frequently used to suggest improvements.)
The reality, as I see it, is that we have nothing to gain by arbitrarily
granting extra formal power in deciding the rules and terms of a challenge to a
particular user. On the contrary, there are a plethora of reasons against
denying this power from the entirety of the site community: the challenge can
be edited to fit in with site-wide standards that are difficult to objectively
quantify (unnecessary I/O restrictions or language-specific challenges, for
example), and ideally (although I concede that this might not always be the
case) the challenge will end up in a state that best reflects the interests of
the community as a whole.
But all I've done so far in terms of addressing the original question—"Who has
the final say?"—is answer with "not the OP." Inevitably there will be
disagreements, not just between the OP and the community but among the members
of the community as well. (In my view, the former should be treated no
differently than the latter.) The question presupposes that in these cases, an
absolute authority has to be established to resolve the conflict.
I don't necessarily think this is the case. I think that collectively, we have
enough common sense to judge the suitability and overall opinion of a given
change and act accordingly. This is already basically how meta consensus works,
and the outstanding culture of suggesting improvements on answers that is
already in place only further goes to show how good at collaboration the PPCG
community is.
So no, I no longer think there should be explicit limits on the extent of the
community's reach in terms of editing challenges. There should be soft limits,
based on common sense guidelines as well as all the complexities of PPCG
"standards" that can't practically be codified or even put into words. This is
also why I keep saying that the OP shouldn't have any extra formal
privilege—in practice, of course the OP's opinion is going to be treated
differently for trivial questions that don't really matter or details
particular to the challenge.
Sorry for the rant/wall of text, but as I mentioned way back in the
questionnaire, this is a topic long overdue for discussion and one that I've
kept quiet about for quite a while.