You have to understand, most of these people are not ready to be unplugged. And many of them are so inured, so hopelessly dependent on the system, that they will fight to protect it.
mp-iexpectation calculates expectation values of triangular (Schur) MPO's. The result is expressed in the form of a polynomial in the lattice size, which is asymptotically exact. Currently, the operator to evaluate is hard-coded into the code, so there is not much useful documentation that can be provided here.