> And you can do what you want with yours!
That does not make a lot of sense. Yes, you can do what you want with your website, but query-string is a way for users to query for additional information or wants or needs. I use them on my own websites to have more flexibility. For instance:
foobar.com/ducks?pdf
I can give many more examples here. The "query strings are horrible" I can not agree with at all. His websites don't allow for query strings? That's fine. But in no way does this mean query strings are useless. Besides, what does it mean to "ban" it? You simply don't respond to query strings you don't want to handle. We do so via general routing in web-applications these days.