My vote is an option not listed: Bring it back for people who want it, but make sure it is easy to disable for people who don't.
I find it very annoying, but I respect those who love it.
As someone who will never use the voices for update notifications, I'm not thrilled that they would take up hard drive space, but, honestly Avast has become bloated, and I doubt the sound files would be very big compared to the rest of the bloat.