Even in this poorly made comparison shot I made you can tell the difference between streaming and "self hosting"
(lemmy.world)
Jack Ryan S3 E3
That's not always a good thing. If it was meant to be 4:3 the extra space on the frame can have set rigging, lights, microphone booms, and in case of stunts even crash pads.
It's one of the reasons the HD rescan of Buffy:TVS sucks. That still needs a proper 4:3 HD remaster.