I'm actually kind of leaning towards keeping the status quo.
We don't have the volume of SO, and many of our questions are narrowly scoped enough that if an answer's outdated, so's the question (and someone can ask a question about a new version and refer to the old one if needed).
I also feel that unpinning the selected answer might be more not less ...
"There is no way you can do this because..." is a valid answer. If you are starting from a potentially faulty assumption then having someone explain that fault and what, if anything, you can or cannot do about it then that is still an answer even if it does not provide the "solution" that you wanted.
Someone might come along in the future ...
I would have preferred a selective unpinning by some rule that
takes into account the difference in the number of votes between
the accepted and the most upvoted answer.
Sometimes one can come upon an accepted answer with one upvote,
with another answer having several dozens of upvotes.
Clearly in such a case the accepted answer is not generally accepted,
Where can I ask questions about Ubiquiti Unifi devices?
Wherever that they accept questions about managed switches, routers and access points. Now, the question you put as example, is not a good question because whenever or not you can ask a question is a two part test: is the question on topic and it's an acceptable question.
Not all questions about ...