The standup would be the safety net when people don't see that they're stuck, know what to do and are afraid to ask / hands down in smth they just don't see the obvious.
Uncovering this in a standup should prevent them from "wasting time" even longer.
I have rarely seen this in my experience so far; either people aren't as dumb as people believe or they know what to report to not fall into this "let me take over here, you seem to have messed up" category.