I don’t think it’s the interruption. I work from home and I got interrupted all day, from family asking me something to teammate asking for my help and sometime joining a call. It’s the context switch that is bad. You can hold off most interruption to try to complete your current train of thought (like give me 15 minutes to complete this and I’ll get back to you). But when you have something that is mandatory, you avoid going into any deep work like a debugging session or architecting a new feature. And most of the time the standup does not really help, because productive teammates will reach out to each other during the day anyway if something impact them. And manager should reach out to developer anytime something pop up that impacts their work, not just wait for next day to let people know.

Standup can be great if the responsibility across the team are spread out, but only at a lower frequency (once a week?).