A few of my coworkers (3 out of ~15 people team) have/had left when RTO mandate was announced, and I know at least 4 people are thinking of leaving as soon as they have a chance. Since the RTO, a lot of my colleagues have started working at 9 am and log out at 5pm pronto. Before RTO, they would be working until 6-7 pm and will be logging in around 8 am. Sometimes, coworkers would even log in late because they were commuting. I wonder if Amazon would check the Slack+Chime logs to see how the activity drops before and after RTO mandate. Based on my observation, I would bet that the activity/productivity drops significantly more.
Glad I left Amazon. I have been programming for 15+ years (have been in a managerial role for 6+ years), and I firmly believe I am (and my team are) more productive working remotely. I will never work for a non-remote companies even if they are big names.