Disclaimer: I am NOT involved in the industry. I program (classical) computers for a living, and have no degrees.

As I understand it, a true power of a quantum computer is simulations of quantum systems. A classical supercomputer running modeling software (based on DFT?) being replaced by a quantum computer I think would be one of the largest (in terms of economic impact) early uses of quantum computing.

Drug discovery (small molecule drugs!), materials science, anything that would benefit from a substantial/revolutionary increase in our computational chemistry reach -- those are the reasons I care.