[pekk]

Mathematical descriptions of large-scale static properties like equilibria are patently not the same as, say, dynamic discrete-time simulations with evolving state.

I don't think we have anything satisfyingly like the latter for economics, but to claim that there is no fundamental difference is just inaccurate.

[overpaidgoogler]

DSGE models are precisely "dynamic discrete-time simulations with evolving state" and they are the workhorse of modern macro.