When the OnePlus 6 launched back in 2018, the phone shipped to reviewers with a pre-production software that had an always-on display feature. The functionality was later removed when the phone started shipping to customers as OnePlus feared it would drain the battery too much. And it has since been one of the most requested features by OxygenOS users. Well, the company finally committed to delivering always-on in a recent tweet. It said that the feature is in the roadmap and will arrive in a future update. Unfortunately, the tweet didn't go into specifics so we don't know how much...