I agree that this keeps the film from being a perfect stand-alone, but there is a mitigating factor in that we do see a lightsaber fight so the lightsaber as an object is paid-off. The fact that it belongs to Obi-wan isn’t to troubling to me. Star Wars is a universe of unbounded promise, so giving Luke a weapon that he doesn’t use in a fight only fires the mind to imagine him using it in a future battle against Vader.
I like this take.
A you can be a hero like your father, or be similar to your father, but without the need to actually fight in the same way. Or using methods and weapons that his father did.
That Vader lives, the Emperor is still around, and the Empire not yet wholly defeated, just fires the imagination of those that watched it at that time.
Maybe more so for kids and young adults who didn’t yet know there would be a sequel 3 years in the future. 3 years can seem like a lifetime when you are young.
But do I like and enjoy thinking about the “what ifs?” and possible “alternative timelines” for Star Wars. All good fun. 😃