It's just one method to make tea. Some teas taste quite different from cup to cup (wuyi oolongs, for example), some are more consistent, in my experience. What I like is that it's easy to adjust depending on the outcome - one infusion is too weak or too strong? Brew the next one more or less.

Yeah, I found a neat article that explains it: https://pathofcha.com/blogs/all-about-tea/a-detailed-guide-to-gong-fu-cha-the-chinese-way-to-taste-tea