I wish more people would learn what can and can't be removed from a URL before sharing it. It's not that difficult, and it's easy to test that the "minified" version still works.
On sites like Reddit (and maybe HN), links with those extra parameters aren't flagged as a duplicate, and end up getting posted multiple times with multiple comment threads.
Because they are data for analytics. Not everyone is a fan of that, especially when the URL points to the servers of a company with such a terrible privacy policy.
I wish more people would learn what can and can't be removed from a URL before sharing it. It's not that difficult, and it's easy to test that the "minified" version still works.