I thought the purpose of the app was to demonstrate an intelligent parsing of the browser signature. After all, the user agent only tells part of the story.

Why would anyone need a website to tell them what browser they are using?

Support. I work Support and Maintenance in an web agency and if I a client client calls up with an issue that I can't reproduce, the first question is what browser they use. There are a lot of inconsistencies between browsers and knowing it gives me one less thing to test with when I'm working on the issue.

I would have asked the same thing before I started reading /r/talesfromtechsupport.