This is why I love git (and distributed version control systems in general). For the most part a short downtime isn't the end of the world. When it comes back up I'll push my changes and that'll be that.
While I actually agree with you, as I look at GitHub as "somewhat reasonable git hosting", that is not how many (if not even most) projects actually use the website, so it is an unfair analysis: people seriously often use (and even encourage others to use) GitHub as the only web presence for their project, using a Readme.md to build a landing page; meanwhile, for many people, GitHub is how they handle incoming bug re…
Webservers can become unavailable. Github has a great trackrecord, and because git is distributed, people can still commit their code locally.
If you would have an SVN workflow, you would either have to wait committing (which is costly), or commit multiple changes in one go.
Also the email example is exactly the same. It IS a good thing you can access stuff locally.
You basically tell that dropbox is useless.