I think this separation is important. A meeting should either be work or social, but it shouldn't be both. Participation at the daily is mandatory. I'm there to report my progress and hear about everybody else's progress. I don't want to socialize with anybody at 9am, I just want to figure out my workday and get that started. At some point I do want to socialize, and then it's helpful if there are opportunities for that, but it should never be forced and I shouldn't be tricked into it.

If I'm at some meeting about an architectural decision, I don't want to socialize, I want us to get to the point. If people want to hang out after that, that's fine. But that's not what that meeting is for.