Astute take by Ben Thompson on Twitter Moments:
What is exciting is that Moments isn’t close to fulfilling its potential: imagine a tweet-based newspaper drawn not only from the best sources in a mobile-friendly format, but one perfectly customized to you. This is what Twitter is already like for power users, but again, getting to that state is simply too difficult. Figuring out how to do this systematically on users’ behalf should be Twitter’s chief aim.
“Should” is probably a bit superfluous: the incentives for Twitter to focus on this type of customization are massive. Twitter is uniquely positioned to understand what its users are interested in, something that at least theoretically rivals Facebook’s imposing demographic information, SnapChat’s youth advantage, or Pinterest’s grasp of my aspirations. The reason customized Moments matter is because there are two payoffs: the user experience is better, and the advertising that will undoubtedly be sold in Moments will be better targeted and more effective.
After Tweetbot 4, Moments are one of the few features (next to search and images/big emoji in DMs) which justify keeping the Twitter app installed. Hopefully, the international rollout won't be too slow.