There are many empty statements when it comes to Sakura.Among all the major characters, she is the one who lack originality. Basically, if she were not in Naruto's team to receive the new Sannin boost, she would be of no significance. Look at these:
1. As a Gennin (I mean child) she had only one potential - that is to be able to detect genjutsu. Apart from this, she was useless.
2. A potential for Yin made her a medic ninja. Even with that and after receiving the teaching of Tsunade, it was an asspul that she got a strength and speed boost similar to Tsunade.
3. She got taught all Tsunade's techniques against all biological prior. Even if Sakura can use Byakugu, she is n neither Uzumaki, nor Senju, nor an hybrid of the two. Thus, her body cannot sustain multiple regeneration or constant strain as Tsunade.
In Short, my opinion is that Sakura should not have been that far. Kishi has done actually far greater than he should for Sakura.
1. No, her defining trait was her intelligence, which is not a trait that can be taught. Shikamaru and Temari are the only other characters that have their intelligence mentioned. Brains > brawn. Kakashi has iterated on multiple occasions that she has a knack for genjustu, not merely dispelling it. She is only seen dispelling it, true, but she was given the capacity to cast it, Kishimoto just never had her do so.
2. Chakra enhanced strength requires perfect chakra control, beyond that of the average medical ninja, which Sakura has, so it makes perfect sense. Shizune admits to Sakura's superior control over her own. If you recall, before her training with Tsunade, when she fought Ino in the Chunnin Exams, Sakura's punch sent Ino flying across the area, so she has some natural strength to begin with. Not as much as Tsunade, but enough to make the skill logical in the timeskip.
3. Tsunade's regeneration shortens her lifespan because cells can only divide a finite number of times. It does not matter that she is a Senju descendant, that is a fact of all humans. Sakura does not have to be Senju to force her cells to divide rapidly, it merely requires perfect chakra control and an extremely large buildup, a few years worth.
So you're saying that because Sakura was not given ungodly advantages since the very beginning she shouldn't have improved at all? Kakashi's clan didn't give him an advantage and he's formidable in battle, in the battles we saw with Hiruzen none of his techniques were clan related and he is cited as one of the strongest. Might Guy can't use ninjutsu or genjutsu and he is very powerful and that has nothing to do with a clan. Just because a character isn't in a clan with automatic power-ups doesn't mean that they cannot improve and become strong the hard way.
