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I think a better measure for relevance for other users in the future is the technical expertise present in a question. No doubt, unreflected questions like "what is the best software for video editing" are pointless.
I also don't see the difference to questions that your policy allows to post. Example: Who cares about how to fix a problem in Windows XP 4 years down the road. Everything gets obsolete with time, don't you think?
I understand you concern that you don't wish to have the site flooded with superficial questions such as "what is the best software for x-action". Forums all over the net are full of this and it is a pain to filter out the relevant answers from the clutter. But I can't follow your argument that 4 years down the road an answer to a software question would no be relevant any more because features usually do not disappear from software. It might not be the most up-to-date software 4 years down the road but it is still a relevent one to solve the problem.
