> You change the volume, and after you mouse-up, this slow building chime plays and fades out. It makes changing the volume feel so slow

You click the mouse once at a desired volume level, and get a positive confirmation. I don't understand how this makes the changing of volume to be perceived as slow... Okay, now I see, the new sound effect in Windows 10...

> but it could be so much simpler and feel so much faster.

e.g. Gnome desktop.