It would be great if developers could consider adding a feature to Orion that allows subtitles on video websites like YouTube to appear in PiP windows.
Subtitles in PiP will make PiP features even more useful. In some countries, people get used to watch video with dubbed subtitles, which is not a common thing in most videos. For those who always likes to have subtitles on, a PiPed video without subtitles becomes painful and thus will be a useless function for them. So adding support of subtitles in PiP might be a starting point for them to use PiP.
As far as I know, Firefox has incorporated this feature into the browser, and it has become quite useful for people who always like to have subtitles when watching videos.
Here is the screenshot for Firefox PiP. (I know it is a highly customised one, with not-quite-apple style design, but it is really useful! )
Users might enable the subtitle option in the website, and once they open PiP for the video, and can directly see the sub on PiP window.