Please read the above notice if you skipped it. I am still seeing members carelessly using nested quotes because it's very easy to respond by clicking the "Quote" button. Members keep doing this in a thread and that's how these nested quotes build up.
However, not editing out the nested quotes, which in some posts I've seen are pretty big, wastes space in the thread and aren't needed for clarity. Really, it's just lazy. I've also sent out some PMs this morning.