Sakura isn't useless. the main problem w fanfics like these is that they take away everything that makes Sakura and turns her into some Mary Sue/something she is not and make her someone who doesn't have flaws or character dept.even worse it's a ' I reincarnated as Sakura' fanfic which is 2xs worse bc all they do is put down kishimotos original character and act like a pick me oc in the place of Sakura. Sakura is a iconic character who is both loved and hated, changing her character is just cringe. If you want to make a OC story make one.