I'm not a parrot that will recite word for word what you wrote. Yes you didn't say anything about silos, but signaling to people that their problems are never your problems is a great way to discourage that person sharing any more information with you. The different agile rituals are a great way to get broad understanding on whats happening, but they will never capture the small problems that come up during the time in between.

Asking for help in person is literally interrupting someone, no matter what they are doing because their attention has to be re-directed from whatever they were doing to you. So there is no meaningful difference between asking for help and interrupting to ask for help. But through social cues I can tell what level of concentration you might be on, and with some precision judge when a good time might be to check in. Hell, I will definitely be wrong some of the time, but that's just life.

The situation is obviously different for someone that is always co-dependent on others for getting work done.