> First, Kagi might give the same results today, but what about tomorrow or a year from now?

When you share from Kagi you share the actual results, not the search that led to them. I believe they don't change over time. If they ever disappear, the next search engine will be just as good for that same question.

> The kind, non-snarky response to something that could be searched for is to simply answer the question.

A few times, sure. There are things that cross the line in my mind though. You do occasionally run into questions which took longer to write than it takes to check. I think it's ok to discourage them slightly while still providing the obvious answer. Lgmtfy worked great for those because you know what is and always will be the first answer for them.