Don't see anything wrong with Sakura finally completing the Byakugou seal.
And don't see how she is selfish when the seal wasn't completed before.
She had an explicitly suspicious TIMING to complete it - EXACTLY in time to FLAUNT it in Sasuke-KUN's face.
If she did it a chapter before, I'd have no qualms with it (still not much foreshadowed, but no big deal) - but it LOOKS as if she did it ONLY because of Sasuke and ON PURPOSE.
THAT is really BAD.
Dunno, whether Kishi did it on purpose too, or what was his idea to begin with - but to me personally, this tastes very BAD.
There's one thing to get new "unpredicted" boosts in time to counter new foes or boosts - and it's another thing to get such an important ability SEEMINGLY just to showcase oneself before your crush.
Especially when it's something that took her
"3 years" - like, am I to believe that
5 minutes (or 1 hour) ago she was NOT yet ready???
Especially with her using chakra all this time anyways.
This sounds so much "asspulled" precisely due to how cheesy it LOOKS.
SERIOUSLY???