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Ok I know a lot of people already talked about the sequel trilogy and its many glaring issues but I wanted to address something that hasn't really been talked about as much as it should be and that is how strong Luke should be.
First of all, let's address a few basic facts which are: Anakin, Leia, and Luke are all confirmed to have the greatest potential by George Lucas himself and the movies which are implied multiple times like when Anakin in TPM is shown to have higher potential than Yoda and Palpatine also realizes Anakin could become stronger than him both he and Yoda are shown to be equals, Luke is stated to have the potential to overthrow Palpatine who is stated to be stronger than when he was in ROTS and Leia is stated by Yoda in ESB that she would be their best bet if Luke dies or falls to the dark side implying both are equals. So all 3 at max potential are capable of killing Palpatine the strongest villain in SW at that point mind you all 3 were implied to be capable of doing that in a rather short amount of time too.
Another basic fact as well Dooku got stronger and became a better duelist despite being in his 80s. Why is this relevant? Well, I have been noticing a lot of people saying Luke was too old and was not in his prime but what they don't know or realized is that Jedi and Sith don't get weaker with age if anything they get stronger. Hell, there is even a sourcebook from TCW stating Dooku was getting stronger throughout the war causing Palpatine to become rather uncomfortable with what was going on with his apprentice. Now Luke was not some old man very much past his prime when he died he was 8 years older than his father who was 45 and the same age as Mace Windu who was 53. So Luke if anything should be either *reaching* his prime or already be in it.
Let's also keep in mind one thing Luke was confirmed to be inactive and didn't train for 6 years. This is confirmed by the ROS visual dictionary stating Luke's temple was destroyed 6 years ago before The Force Awakens happens(Which leaves the question how the jedi were a myth? But that is a question for another time). So Luke wouldn't have gotten much weaker than what he once was.
And the final fact was that Anakin would be on the same level as the ones of mortis and so would Luke and Leia. This is confirmed multiple times.
Despite all these facts that are well known throughout SW TLJ Luke is somehow suggested to be inferior to Kylo,Rey and Palpatine. Hell he was stated to be afraid of Kylo and Rey's dark side power. Yet Luke should easily be someone who does not feel threatened by it because he is still far stronger. Let's keep in mind Palpatine is heavily suggested to be at his weakest in ROS until he absorbs the dyad and still stomps all over Rey and Kylo easily. So if a weakened Palpatine could do that why is Luke the guy who should have been above Palpatine *ages* ago somehow inferior to that version of Palpatine. No matter how you judge it Luke should be capable of basically due what Palpatine could do but even more.
I am just going to throw in what Luke could do or has done in the EU:
Originally Luke mastered all 7 forms of lightsaber combat, easily defeat his dark side nephew by just staring at him(Ps Luke was pushing 60 when he did that), fought a being on the same level as the ones of mortis, shown incredible intelligence and wisdom as the grandmaster, has mastery over the dark side and is strong enough to the point that he is confident in beating beings on the same level as Vader without to much difficulty in the form of his nephew.
To anyone who wants to argue that Luke should not be that strong well you have to argue against the narrative as that's what he was to become when he reached his prime.