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In relation to all other (15+) SE sites that I'm active on, this one has a very large number of (follow-up, me-too) questions posted as an answer.
(I'm not proficient with SEDE, so I cannot give actual numbers).

I have no issue with flagging them as 'not an answer' when reviewing them, because that is a very quick action.
I'm also not afraid that this will put off new users. It is a clear signal to them - if they think their question is important, they will take the effort to write a new one.

Still, I wonder, would there be anything else we could do to reduce the noise?

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Still, I wonder, would there be anything else we could do to reduce the noise?

There's probably something that could be done, but in any case it is beyond the authority of Travel.SE users or mods as the UI for new users posting an answer is beyond our control. Try re-posting your question on Meta StackExchange.

I have no issue with flagging them as 'not an answer' when reviewing them, because that is a very quick action.

You are correct that it's not a big deal. Flag the answer and it will be removed shortly by a mod or by the review queue. No need for any radical measures to prevent those kinds of answers :-)

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Some questions attract many more of these than others: particularly, questions which are about a common situation that may be faced by many people, but with slight variants.

Such questions can be protected by moderators and 15K users, so that they don't allow answers from brand-new users. So if you notice a particular question getting a lot of non-answers, you can flag it for moderator attention and suggest that it be protected. When you reach 15K reputation, you'll be able to protect questions by yourself.

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