[francislavoie]

The problem is, in the browser, relative URLs (like on CSS/JS assets and such) won't be relative to your index.html if you remove the trailing slash, and they'll instead be relative to the parent directory. That can mess things up.

Of course if you're using absolute paths in your HTML then this isn't a problem, but it does become a problem if you want to move to serving this same site from a subpath, because then your absolute paths won't be constrained to this subpath.