Supporting this out of the box adds an extra layer of complexity to account for while it's only beneficial to a small number of installations. I would leave this to extensions.
In the past there was a system called echoforums that did something similar. I've worked with it and hated it. Also the benefit -even for those maintaining multiple installations - is minimal. Because with any update you'd need to make sure every installation is updated at the same time because DB, styles and filesystem would need to be in line with each other. That makes updating a bigger task that can't be split into several smaller tasks. The diskspace benefit is minimal since the core filesystem is only about 25MB large. Most space is used by attachments usually.
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