I remember windows 95 made a sound when it started. Maybe now that boots are fast there is no need to notify a user who may have focused on something else while waiting ?
This page has the files for the default system sounds for Win95. https://www.rjgeib.com/about-me/sounds/sounds95.html
You can see that there was a sound when the trash was emptied or when you receive a new mail.
This was really a different, simpler time. Imagine an open space where each computer make a sound each time you receive an email, even with a good spam filter...
Funny.