Goes to show how much of a lazy/cheap hack Lucas is. Luke screaming as he fell down the shaft could’ve worked if Lucas’ gotten Hamill in to record it, or someone with a relatively similar voice. But no, he reuses the Palpatine scream 'cause he couldn’t be bothered to put the extra ounce of effort into it.
I wouldn’t go so far as to call Lucas a “lazy hack,” but I agree that he didn’t put much effort into the SE. Adywan’s version shows what the SE would look like if Lucas actually committed to his goal of updating the movies.