They're daily for the reason that if they're not unnecessary, it's possible to react quickly to obstacles. In the ideal case, if everyone just says "yep, still

They're daily for the reason that if they're not unnecessary, it's possible to react quickly to obstacles. In the ideal case, if everyone just says "yep, still working on that feature, I see no obstacles, next", standups can last 3 minutes. In the case where someone says "I'm blocked by a PR by Geoff from Team B" for 2 days straight, the team knows to step in.