I love how everyone makes up their own stories and reasons as to why the ANH saber fight doesn’t look like shit - when it does, and the only reason is because they were limited to the extent they had to do slow movements close to eachother to not destroy the props and/or the glowing effect.
It had nothing to do with “Vader is being restricted because his last fight didn’t go so well”. Or “Vader is testing his ground”. They were simply restricted; end of story.