Not unnecessary and unimportant, it differs in what it is looking for - many avast users can report on sites that they visit - this collective information can be used when using a search engine, google, etc. as to the sites safety/reputation, etc.
When you are at a site you can check for more information by clicking on the AOS browser icon and it expands the view, see attached image.
The primary web protection is provided by the Web Shield, you should be just fine with that.