Exactly. Just today in the office there was a coworker who was unfamiliar with a particular internal tool. He asked me, I walked to his desk, and pointed out the couple of buttons he needed to click in that internal tool. The whole exchange finished in one minute. After that minute I went back to coding. I stayed in my flow.

But if this request for help arrived via group chat, I wouldn't have bothered to help. It was simply too much effort to either do screen sharing, or open the internal tool on my computer, replicate the state of that UI, and then describe the buttons the coworker needed. The one-minute interruption would be a ten-minute interruption. I wouldn't stay in my flow.