That doesn't match my experience. At an investment bank, or hedge fund, you don't usually go to interrupt someone. You "ping" them on chat, set up a videoconference, or something else. You meet people at the floor kitchen, the cafeteria, or meeting rooms. In NYC floors they don't even say good morning to the person next to them. Even if on the same team and both going together for drinks at the end of the day. It was shocking how isolated workers are. This was years before the pandemic. And I'm not just talking about trading floors.