Have you ever given advice on something, then a month later given different advice on the same thing?
Most likely, yes, but not that I can remember. Sometimes my advice is interpreted or explained in a different way. But it doesn't change. In a place like an online community, I have never felt that I know an answer that is good enough.
That probably stems from another one of the things that I ponder, that derives from my first thought to any question: "Did you really mean to ask that question". I find that difficult to do on the internet. I am probably better face to face.

I usually feel good when that happens because it means I'm making progress.
Well, I know what my own attempts would be to tackle the problrm which someone else's question raises. And so I learn from other people's responses. That gives me a feeling of progress.

Always contribute your ideas .. worst case is that somebody comes up with a reason why it won't work.
I think that replying with a misleading answer is not a good response. One should be confident that one knows a good answer that will help the person posing the question. Not throw some vague answer at them hoping it is right. And, as stated in my original post, if I but wait a few minutes, then somebody else more knowledgeable has provided a better answer than mine.
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Graq