Except if you're already deep into work because you start earlier than everyone else then they just rip you out of your flow.
They also tend to be longer than five minutes in terms of herding people to them etc.
They also tend to be longer than five minutes in terms of herding people to them etc.
If anything, by being at a fixed time, either at the start, or the end of a team’s day, it’s far easier to prevent a standup from disrupting deep work than a Slack message would be.
A slack message won't disrupt my deep work because I'll have notifications turned off, unless it's extremely urgent in which case it would be too urgent to leave until a standup anyway.