Twitter's black box algorithm creates a timeline of tweets that is optimized for engagement. It is designed to keep you on the site for as long as possible, creating a never-ending stream of information which favors super active users, shows tweets from unknown accounts just because someone you follow liked them, throws unnecessary promotions at you, and the list goes on. Infinitely scrolling on this "curated" feed is a waste of your time.
This add-on is supposed to be an off switch for Twitter's fire hose of a timeline. It removes the timeline and discover / "who to follow" sections on Home, nothing else, so you can still use messages, lists and access notifications if you please.