system
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A serious programmer would rather optimize his program to run as smooth and low on resources as possible and offer a UI to be easy on eyes and easy to understand, people generally don’t mess around with antivirus programs, they want a program that functions on principle “install and forget”, this isn’t a chat client, or an MS Office program so people will be starring at it’s UI all day.
Now why would avast team spend resources and time on a feature that would please a tiny amount of people, if they can concentrate on things like improving performance, detection rate, include new features( like Rescue Disk) that are much…much more important and more people oriented.