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Flagging should never be an alternative to downvoting; downvoting is a community process while flagging/deletion ends up being a unilateral decision that should only be reserved for the more egregious cases. Anything with an element of doubt (e.g. this situation, where it does attempt to solve the problem even if not by answering the literal question) should be left to voting, not to deletion.
@terdon I did say we should probably reduce tags, with the caveat that it must be a manual retag preserving any version info into the body, not an automatic merge. Things like the move to netplan are very much distro(and version)-specific, nothing to do with the kernel, and the distro version offers a hint to answerers and future searchers because "how do I add an ip address to a nic" is completely different between ubuntu-18.04 and ubuntu-16.04 - but that can be in Q body, not necessarily in tag.
"Not An Answer" is reserved for responses that are doing things like trying to ask another question. Anything that remotely passes the very very low bar of trying to answer the question in any way (even if it's a frame challenge) does not qualify for NAA. This is the kind of situation where you could downvote/comment, but does not quite rate a flag. A poor answer is still an answer.
@fixer1234 The traditional view has been that asking for recommendations is right out (it's too personalised and too time-localised) but generally asking about compatibility is fine because it will always be relevant, even if only in a retro hardware sense 10 years later. Unfortunately a lot of close-voters mix these two cases up.
I'd be careful of any merges or synonyms; especially the one @fixer1234 suggests. "DynDNS" appears to refer to a specific brand/service rather than the concept of dynamic DNS updates as a whole.
Re: product purchase links, they are more or less accepted as examples accompanying a searchable name, especially for more obscure components. It's generally only an issue if the answer is otherwise poor, or there's a pattern of linking to the same site across many answers. Requesting them in the question is off-topic by default but providing them in an answer is not.
