Oh, I missed that the setoptions was for the whole processlist. Of course,
that makes sense. Does it make sense for there to be a match between
processlist options and process options?

I think the documentation tells the whole truth, but maybe it is possible
tell it more simply. I would not worry about it: it is often hard to see
such things clearly until some time has passed. That's true for me, anyway.
It's why I can write long things clearly, but only very slowly :)