A few things from reading the comments and the overall thread. I don't just don't quiet understand the argument at all.
Firstly, Boruto started off with shadow clones, and after the time skip, he learned Wind and Lightning release. Around that time he was one week away from becoming a Genin.
On the offhand, Mitsuki when he entered the Academy already had Wind and Lightning releases, Sumire could already use Water Release, and Iwabe could use Earth. There was also minor "Ghost-induced' Academy students (and those who had been expelled) who were using elemental natures, more notably Mitsuki's introduction episode where he beat a Katon user before he and Boruto first met (face to face).
Elemental Natures in the Next Generation are taken not as seriously as they used to. Even now, the standard seems to be that everyone has at least two elemental natures. Sarada having Lightning/Fire, Mitsuki still having the same natures when he was a kid, and then Boruto later learning his 3rd one before the film. There's also the fact that untalented or non-prodigal characters like Cho-Cho who were stated to have Lightning Release from the Data-Book, along with a few others.
There isn't really much thought about it. Boruto's forte is ninjutsu, and if he's considered to be a Genius, then he'll be different than those around him - Who already have 2.
I don't really see the problem. It's not like he throws out a new piece of ninjutsu every other fight, even now I'm kinda disappointed they capped him into using only Rasengan and Shadow Clones, despite obviously being more versatile.
On that note I don't really see anything wrong with Boruto's Rasengan either, he learned it in a week, and it was pitiful. Barely could dent a tree. He somehow managed to apply wind chakra to it, but he was doing it without being taught. He just did it naturally, which showcases how much talent he has - And that Ninjutsu is his "thing".
It's not that much different than the Gaiden showing that Sarada already had mastered Shippuden-Sakura level of CES despite not even being hinted at training once in her Academy days. These kids are just way more talented and have resources that make them superior.
As long as there's a certain amount of training and flaws then it should be okay - But there shouldn't be a character who just gets away with asspull to asspull without any kind of flaw. Like not being the strongest/losing fights, having limitations, and then personality/character weaknesses.
Considering Boruto got his first major win against Ao after the Manga's 2 year run, and the Anime's first year run. I'd say they are doing a good job at capitalizing his strengths and weaknesses, because it would of been hella easy to just make Boruto the next "Itachi" and for him to never lose.
Just look at Mitsuki who came into the Academy with 2 elements, has Sage Mode, beat Shino, barely lost any fights (can't count any L aside from Kakashi jabbing him in the gut), and the fact that he's clearly the most level headed/smartest of the group.
Just my 2cents.