Update 1: 2019/05/24 6:35am PDT
OnePlus forum post confirms the new features that will come to 5/5T/6/6T, all of which will get Android Q
When OnePlus announced its latest flagship phone, there were some interesting software features introduced alongside the impressive new hardware. Not all of them will be coming to older OnePlus devices but many of them will, including Zen Mode and the native screen recording function.
In a OnePlus 7 Series AMA on the company's forum, the following comment was posted by a representative: "Non-hardware dependent features of OxygenOS will be available on OnePlus 6 and 6T soon." While not specific, it means it's likely that most of the new software enhancements from the 7 Pro will be coming to at least the 6 and 6T, unless there's a hardware-based limitation.Read More
[Update: Further confirmation plus Android Q for 5/5T promise] Older OnePlus phones to get screen recorder and Zen Mode from 7 Pro was written by the awesome team at Android Police.