Earlier quoted context omitted.
That's the thing, Scrum basically assumes that all software teams are so dysfunctional that they won't talk to each other unless and until everyone is watching.
Scrum! It teaches bad teams good habits! Nothing in scrum stops you talking to anyone at any time. The stand-up makes sure that you have to say a few words to the whole team and other interested parties, daily. I like to read criticisms of scrum, when they're not straw-man ones.
I'm a big believer in trying to persuade people to keep feedback loops short, make teams small and cross-functional, and to design/code/test/ship in the smallest increments possible. At this point, calling an approach agile/scrum/xp carries a lot of baggage.
If people don't get the why (e.g. the team isn't small and cross-functional, and people aren't working on tiny increments) it kind of doesn't matter if you get everyone in the room at the same time every day.