Lvalio said “And Lal added that who could understand the mechanism would be at least someone who held the State of Sotapanna”, this is the first time I heard of this, although I’ve read almost all the posts on this site (included forum posts).
I heard Lal said about the story of an elder monk who excel in Dhamma knowledges. He often teaches Dhamma to other Ariyas, but he himself hasn’t attained Sotapanna yet.
So understanding mechanism of how things work is very helpful, but it has little to do with actual Panna (understanding of Tilakkhana, Satara Ariyasacca). The Buddha even said that the mechanism of Kamma is on of the 4 “Unthinkable” (Acinteyya) and will lead to madness if one pursues. But understand the general schemes of Kamma, Rebirth, Loka is very helpful to grow Panna too.