I haven’t been following this thread but would be strongly againstOnly in the Download table, not in the displayed lists.
The members who have "Left" or "Spam Left" (or removed by any other means) would be distinguished from active members by one or more of the Status column enumerations.
The idea is that someone who is managing their membership off-site in a spreadsheet or database application would then have a single table in which they could find any member, past or present. For some of the things Bob wanted to track that would be much more convenient than downloading the "Past" members separately.
Of course his original complaint was that as things stand one cannot download the Past members at all - he has to screen-scrape them.