Though many (so many) people have expressed it far more eloquently, the main sentiment here is: Why?
Why would Twitter, whose championing of the immediacy of breaking news and the growing need for global discourse, test a new feature that seemingly risks undermining the platform's greatest strengths? A Twitter spokesperson, speaking via email to Motherboard's Rachel Pick, dubs these timeline-out-of-order shenanigans as an "experiment" aimed at promoting "the best content for people using Twitter."
After Twitter's previous moves of general DM anarchy and a swift funeral service for Favorites, society is left to ponder the very distinct possibility that Facebook might very well have infiltrated everything we cherish. If you're into self-torture, you can peep how this "experiment" sabotages the timeline below: