Naruto and Boruto had different upbringings. Naruto grew up as an orphan and only got an education from the academy, which teaches the basics, not many people to train with lack of friends, in addition to it being implied the village was limiting his growth due to the Nine-Tails within him.
Boruto, in comparison, grew up as the son of the 7th Hokage and a Clan Head. His father could have made Shadow Clones help train him while busy, his mother, aunt, or grandfather also could have helped him outside of school. The village has no reason to sabotage/limit his development. Overall, Naruto started with less help, while Boruto would have likely gotten more right from the start, letting it shine sooner.
The Boruto Anime Proves Naruto’s Son Takes After Him in the Best Way, but how?
Naruto was incredibly gifted, though it wasn’t apparent. Large chakra reserves, as a descendant of the Uzumaki Clan. Nine Tails giving him virtually limitless chakra ontop of his Uzumaki genetics), though this was a detriment to him at first. It’s implied he could have learned the basic Academy techniques if not for the Nine-Tails making him pour more chakra into his technique than he wanted, causing it to fail.
Naruto wasn’t a loser because he lacked talent, it’s more he wasn’t being taught how to utilize all of his natural talents from an early age. Kakashi could be blamed for not teaching him how to use Shadow Clones to cut down on training time in Part 1. Jiraiya probably should have focused on his sealing strength as an Uzumaki as opposed to helping him make a bigger Rasengan.
The Academy could have helped him with chakra control so he wasn’t wasting his immense chakra reserves. Overall, it was a group of bad teachers not making the most of the gold mine they were given which is Naruto Uzumaki. In addition to the village possibly limiting his growth due to being the Jinchuuriki for the Nine-Tails and not having as much time to train as a kid due to lack of sparring partners/people willing to help him improve.
