Me too. Back when I was in college, all MacBooks still had the chime and it was obnoxious when you were sitting in class and someone's computer "went off" when it was booting up. The fact that there was no way to block it was absolutely crazy.
The first thing I'll be doing when I install Big Sur will be to disable this so I'm not the jerk having my computer disrupt anybody the next time I need to open the lid in the library or anywhere else I don't need to draw attention to myself with the "look everybody, I have an expensive laptop" sound.