alt Hacker NewsScrews have been around for about 3 millennia at this point. They have patently failed to obviate the use of nails. So by this analogy we can expect the 'Only GPUs do the work.' believers to be still promising this, any day now, about three thousand years hence. (-:
Software is getting more complicated and a lot of it depends on both cpu and gpu.
If you have a systems tool that gives an overview of resources used, then better monitor them both.
Imho failing to do so is not future-proof. Your opinion might differ.