Econophysics is really crank stuff but some people really like to shit on econ without knowing a tenth of the discourse in the field. How can someone not have heard of carbon taxes or balanced growth paths?
What's funnier is that you both are revealing that either you don't know the methodology of solving economics models, or don't know what the physics equations represent. Nature acts to minimize convex functions while economic agents move to maximize concave ones. Of course the solutions end up the same.
Don't think that our utility functions are correct or actual people act differently? Honestly only having profits to maximize is just a good first order approximation. That's why we have an entire field working on supposedly irrational behavior and backing up everything with data and experiments.
Now economics does have its huge problems, but things aren't as simple as this. But if you still see a huge problem, just get your correct model, back your results with data and enjoy getting the Nobel prize.