I agree this is the key difference, and I think the root of one of the problems: many workplaces that implement standup meetings have a manager or PM present at

I agree this is the key difference, and I think the root of one of the problems: many workplaces that implement standup meetings have a manager or PM present at the meeting, even though this is discouraged by many agile evangelists. Sometimes the PM even acts as the scrum-master, despite the scrum process as officially conceived really discouraging that. And then it turns into daily short reports to the boss.