The chin bar lines up with the ports (USB and power) on the back, and is probably where the speakers are. So I think they prioritized thinness, which meant the

The chin bar lines up with the ports (USB and power) on the back, and is probably where the speakers are. So I think they prioritized thinness, which meant there was not enough room for screen+board+ports stacked, and they had to offset them. It's probable that the whole SoC and board are in the chin, given how small they are in the MacBook Air/Pro: https://www.ifixit.com/News/46884/m1-macbook-teardowns-something-old-something-new https://www.ifixit.com/News/46884/m1-macbook-teardowns-somet...