It’s just the GET parameters it’s stripping, those can be used for all sorts of things to pass information to a website to be used as variables for all manner of innocuous things… They just get (ab)used by trackers more than normal web traffic since most of the other uses comes from a site that can pass that as a POST instead, which embeds the parameters in the request header rather than making the URL a mile long, and wouldn’t be useful (and could actually be problematic) to be shared with others as part of copying it