Status Updates From Leonardo and the Last Supper

"Likewise, Leonardo’s Last Supper was created not for the art historians and tour groups of a later, secular age, but for a band of Dominican friars who ritually commemorated Christ’s sacrifice through the celebration of the Eucharist."

I dont know about you, but I picked up the book to know about how he made the painting. The author inserted some of his other unrelated inventions as well. I mean, the politics? I get it but this particular chapter is useless. I read this book to know about THE LAST SUPPER not his helical contraption. I get that the man was genius but if i'm interested I'll pick up his memoir instead.