Edit: I started out as a BBS sysop. So you can see which side of the equation I'm on. The value of knowing how to admin door games is practically zero at this point.
There is a vast difference between having 10 years of experience, and having 1 year of experience repeated 10 times.
The reason there are often few differences between a 5-year career and a 10-year career is that most people find a niche after a few years, and comfortably sit there. But if you can find someone who spent 10 year actively learning and broadening their skills, never settling in... those extra 5 years are immensely valuable.
My now self, with nearer to 10 years experience would tear my 5 year experienced self to pieces on all things technical. I'm doing things now with great efficiency whereas 5 years ago I would probably have made a bit of a mess of them.
Though obviously at year 5, if asked, I would have happily told you I knew it all already :)