Last February was excited that YouTube TV was finally on Roku. But then when played the video portion was jerky, just awful. So went back to using the Samsung app. Finally a member here last month mentioned it was a roku problem related to the HDR roku display settings.
That temp work around fix was to manually select the correct display e.g. 4k 60Hz but without HDR. It worked but needed to be changed every time when changing channels.
--->Very surprised several days ago that an update had resolved that video bug
Posted this as a heads up to any user still viewing sans HDR so they can revert back the roku display settings. Knock on wood all should now be able to view YouTube TV without any more video problems.
*Roku Premiere+ paired w/samsung 4k Television