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I don't think there is a good reason for this, it's a legacy from the stackoverflow cloning effort in the parent CNPROG project.
Tried, but could not find information on redirects being bad for SEO. Is there anything definitive on this topic?
We might in the future use the main page for some other purpose - say listing of available forum spaces - fancy user groups that also segment content, but for the case where groups/spaces are disabled we could remove the "/questions/" prefix.