Are you seriously trying to throw IE6 into this to attempt to prove your point? We aren't talking about antiquated browsers no one should be using today.
For contrast I now support IE8 and IE9. Without jQuery. It's bad. Really, really bad. Like, there isn't indexOf on Array and asking for polyfill is forbidden.
It's great if you never had to deal with them, but that doesn't mean it won't happen.
Note: It wasn't a one-off job either. There were multiple jobs, government sector.
Us programmers often get this wrong.