In a series of Tweets sent by @TwitterSupport, the company explained that while it tries to balance showing you the "best" Tweets with the most recent Tweets, it "doesn't always get this balance right" (via TechCrunch).
Following user frustration with this curated selection of Tweets -- which is sometimes mixed in with ads, Tweets your friends like, and more -- the company says it will soon provide an easily accessible way to switch between a timeline of Tweets that are most relevant for you and a timeline of the latest Tweets. The reverse chronological timeline option will come in the form of a test for some users "in the coming weeks."
4/ So, we’re working on providing you with an easily accessible way to switch between a timeline of Tweets that are most relevant for you and a timeline of the latest Tweets. You’ll see us test this in the coming weeks.— Twitter Support (@TwitterSupport) September 17, 2018
The company didn't divulge when the full and "easier-to-access" reverse chronological timeline setting will launch, but says it will announce further details via @TwitterSupport.
Twitter first rolled out its algorithm-focused timeline in early 2016, curating Tweets for each user based on their activity and ditching the simple reverse chronological flow of Tweets. The company tried to allow some form of customization with buttons that trained the algorithm for Tweets you might not like, but many users still opted for third-party apps like Tweetbot, which stick to a reverse chronological format and don't include ads, "In case you missed it," recommended Tweets, etc.