Wikipedia does pretty well with redirects and disambiguation pages. Email can be forwarded. It's more difficult if you don't have a redirect mechanism.
I don't think any of us would prefer a meaningless number to a username? But you can create a new account if you wish.
And of course we use meaningful names in source code.
One scheme I like for URL's is a meaningless id followed by an SEO string in a URL, where only the number is used and it redirects if the SEO string doesn't match.
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Wikipedia does pretty well with redirects and disambiguation pages. Email can be forwarded. It's more difficult if you don't have a redirect mechanism.
I don't think any of us would prefer a meaningless number to a username? But you can create a new account if you wish.
And of course we use meaningful names in source code.
One scheme I like for URL's is a meaningless id followed by an SEO string in a URL, where only the number is used and it redirects if the SEO string doesn't match.