That's definitely a consideration, and I'm not watching 72GB 3-hour length 4K movies remotely if the far end's internet connection is insufficient. But the times that I find myself in such a place are fairly uncommon these days. If I were spending a lot of time in places where Internet service was considerably worse than where I travel now, I would probably just download the 1080p, HEVC/x265, 2.2GB total file size version of a movie and call that "ehh, good enough".