[efm]

I recommend the book (free online): https://www.hsph.harvard.edu/miguel-hernan/causal-inference-... and the associated Coursera course. It's both simple and subtle to be able to get causality out of observational data.

[0101010110]

This is true only for a small subset of Causal DAGs even within this 'Causal Calculus'. It can't account for circular causality or discontinuous relationships. That's not to diminish your suggestion, only to contextualise it.

[benibela]

The are new theories for cycles: https://www.eur.nl/sites/corporate/files/2018-07/mooij-pup-2...