It essentially comes down to bitrate. Even with 1080p, there's still a noticeable bump in quality when you go from the "just enough" streaming bitrate to the

It essentially comes down to bitrate. Even with 1080p, there's still a noticeable bump in quality when you go from the "just enough" streaming bitrate to the "here just have the whole thing" version from a local disk. Both versions still decode to a 1080p (or 4k) frame, but the local version means you don't have to compress it quite as much.