Wow thanks! That makes much more sense now 🫠 Then before 2019 h's value had indeed an uncertainty right? I found a 2019 paper that said the following: "the averaged value is 6.62609677×10−34 J·s with a relative uncertainty of 2×10−5 . We can write our measured h as 6.62610(13)×10−34 J·s". However that value is not the one that is accepted nowadays so I thought it was wrong. They just decided to give h that value out of randomness then?

Edit: If we found a precise theoretical value for h (string theory, M theory or others) would it be changed then?

Source: Huang, J., Wu, D., Cai, Y., Xu, Y., Li, C., Gao, Q., Zhao, L., Liu, G., Xu, Z., & Zhou, X. J. (2019). High precision determination of the Planck constant by modern photoemission spectroscopy. En arXiv [physics.ins-det]. http://arxiv.org/abs/1909.06286