We are also changing how remote playback works for streaming personal media (that is, playback when not on the same local network as the server). The reality is that we need more resources to continue putting forth the best personal media experience, and as a result, we will no longer offer remote playback as a free feature. This—alongside the new Plex Pass pricing—will help provide those resources. This change will apply to the future release of our new Plex experience for mobile and other platforms.
I thought their implication was that they would use the WebUI for downloading videos for offline watching later. Beyond that, I don’t really know or care; Their suggestion was weird to me, but I took it at face value and replied accordingly.