The OnePlus 5T Can't Currently Stream HD videos Share
In order to stream videos in HD from the likes of Netflix, Hulu, Amazon Video, etc., phones need to support something called Widevine Level 1 DRM. As some users on OnePlus's forums have noted, the 5T only supports Widevine Level 3 which is capable of just SD video streams.
You must be kidding me! Sounds like YouTube does HD video, but basically no other major apps do anything but SD.
For a good laugh look at the comments:
What's mind-boggling to me is why people want to watch videos like movies and TV on their phone instead of on a monitor or real TV.
How was this not noticed / pointed out in the reviews of the phone? I mean, the original Oneplus 5 has been out for many months now and nobody has pointed this out until now??