@oldgeek. Are you saying you would like what we think is spam tagged and left in the inbox?
No. I would prefer my ISP do no filtering because I believe my AV client can do an equally good job of spam detection but I have total control as to how spam is managed.
IMHO the attraction of ISP-mediated spam detection dates back to the days of dialup when download speed was extremely limited and it was therefore desirable to eliminate spam from the email-download process. Suffering the loss of false positives might have been worth it overall. Technology has moved on a lot since then.
ISP-mediated spam detection would probably appeal to those of us unable to understand how their AV spam detection works (or have none).