Because those are byproducts of trying to build AGI to help augment the white collar workforce, which as others have said purely digital work is just lower hanging fruit right now.

It may cost millions of dollars to build a model, but that can be after an exponential amount of iterations. Doing the same with IRL hardware and capital is the exception not the norm.

The next phases are better digital twins and applying these advances to them to find strategic meat space projects to put hours to.