This is a terrible change and I urge Apple to undo it. The new sound is practically inaudible. I use notifications as a safety and security measure: while I am working, I use a special do not disturb mode to allow only certain notifications, one of which is new activity from my Arlo cameras. I do this so that I know when a package has been left on my property and/or a person is on the premises. I can no longer hear the notifications if there is any ambient noise where I work, and there is always ambient noise where I work. This is extremely disappointing.