It’s not untrue, it’s airline specific, but in the recent past it’s generally true. My airline pays LTD until 65 for all conditions except mental health reasons, which only pays 2 years. This was common (that generally mental health wasn’t covered as long) when we signed our CBA 6 years ago. Maybe things have changed in the new CBA’s. Mine hasn’t yet.

If you start addressing the issue, then legally you’re supposed to let your AME know. This generally isn’t a problem, which I agree with you on. UNTIL you start to get into the grey areas. There is going to be a point where medical professionals, AME’s, and the FAA don’t all agree where the line has to be drawn on whether you qualify or you don’t for a 1C medical. This has been an ongoing matter, and the FAA has become more lenient, but there will always be a new limit where the edges aren’t crystal clear.