You don’t have to share at an AA meeting. The are no rules.
If someone truly wants to stop drinking, they will do whatever needs to be done.
There’s no “rule” but the point of the meetings is to share, those who absolutely positively never share (which is a pretty solid description of my life) aren’t really working the program.
Now on your second point you’re right. But it’s good to keep in mind for the vast majority of them that’s something OTHER than AA.