Causality points both ways, though. Games use the GPU because that's where the compute power is—hence, that's why graphics are so emphasized over other features

Causality points both ways, though. Games use the GPU because that's where the compute power is—hence, that's why graphics are so emphasized over other features. GPUs are so powerful to meet the needs of gamers. There's nothing inherently faster or better about a GPU because most tasks don't parallelize that easy—it just so happens that the tasks that DO parallelize easily are highly emphasized.