What happened to the promised efficiency gains?

https://www.youtube.com/watch?v=VfN2g3aWAyA

According to this video, the S25's battery is only slightly better than S24 exynos, and worse than S24 snapdragon.

https://www.youtube.com/watch?v=gKs6M6HlfRg

From this video, the S23 is slightly better than the S24 exynos.

So I conclude that the S25 and S23 are nearly identical in battery life. From how much the Snapdragon 8 Elite was hyped, I was expecting a 20-30% improvement. Now I know for sure that sticking with the S23 is the right decision.