talking inside the office

Hi everyone, I work in the IT field, and recently I noticed that one of my colleague received a warning mail from management just for talking inside the office (not loud arguments, just normal conversations).

I’m curious is this a common practice in IT workplaces? • Do companies really issue warning mails for small things like this? • How strict are professional environments generally about talking during work hours? • Should this be a concern about the company’s work culture?

Would love to hear from others who have worked in different IT companies.