Sakura was:
1. A coward
2. Virtually skillless
3. Useless in battle
4. Crying in the sidelines
Sakura is now:
1. One-fourth of the reason Kaguya was defeated, where if she wasn't there, Kaguya would have flew upwards and Naruto and Sasuke's plan would have failed.
2. Half of the reason Sasuke was brought back, without which, Kaguya would have succeeded
3. Confident in her abilities and is no longer slacking
4. A medic on the same level as Tsunade
5. The reason why Naruto is alive right now
Sakura's development is good, and without her, Naruto would be dead, everyone would be White Zetsu, and Sasuke would be in a desert all alone. She's just as much as a savior of the world as Kakashi, Naruto and Sasuke.