Fisherman.
You said. “Obviously, no one stops serving unless they no longer qualify. Everybody knows this unless they are “new in the truth”.
That does not apply in every instance. I served as an elder for many years and took a breather and stopped serving for a few years about twenty years ago. I had my own reasons for this, nothing to do with no longer being qualified. I served as an elder again later until finally I found out about all the money-grabbing the GB were putting in place (I was doing congregation accounts at the time), and all the other dodgy stuff like the generation teaching and other doctrinal gymnastics. I resigned again despite the desperate attempts by the coordinator of the body of elders to get me to change my mind and stay on. They made the normal announcement and maybe some were wondering why and suspected I had been up to no good. If anyone asked I quoted family responsibilities, which was actually part of the reason for my departure. Most accepted this and didn’t treat me as if I had done anything wrong. Even now I get asked to do stuff on the meeting and so on, in the hopes of getting me to serve again. So you can stop serving without everyone thinking you no longer qualify.