To whom it may concern:
The phrase “Emergent Properties” is, like the “Law Of Unintended Consequences”, a way of saying “we don’t know why that happened but, golly, would you look at that”. Except that get to sound very smart and clever while you’re saying it.
Please note that if you use “emergent properties” as an engineering principle rather than a demarcation of ignorance, you will be asked to demonstrate your work. Furthermore, you’re not fooling anybody.