In addition to what Harmy said (which I agree with), I’ll add my two cents on the issue. Our commitment to purchasing the Blu-Rays before downloading any of these edits/scans/whatever is a sort of a gesture of goodwill toward Lucasfilm/Disney. Kind of like, “Look, we know you guys (and Fox) own the stuff, and we want to support you, the owners, but we also want to enjoy these movies in different ways.”
This is put perfectly.