Yes absolutely it was iconic.
Also for the reason and logic DavidR has put forward.
And if someone doesn't want to hear it, The option was there to disable Voice announcement
If it doesn't happen to be working - the first indication you get is when avast reports the VPS is out of date - a day late and a dollar short, as they say.
The way it was people had that very option to disable the auto update notification and voice over.
I still on occasion bump into that youtube clip of a wrestling match and the announcers PC piped up with the old 'Avast! - virus database has been updated - iconic, yes, different yes, sets avast apart from the crowd.