OK, agreed, bad idea (I was not the only one) - let’s forget it. :).
Since there is no improvement to the Notifications System in the works afaik, are there other ways around?
Alternative: turn off notifications, let people learn to tag multiple “top identifiers” simultaneously (or move sequentially to a “2nd Top Identifier” if they get no reply from the “Top” one after a while) (or make the effort to write a Direct Message).
Other solution : leave notifications on, but quit IDing a taxon just before becoming “Top identifier” for it. Not so hard to keep track of, thanks to this web app.