I agree, whenever something claims to be "pretty much invisibly to the application", it means the abstraction is going to be too costly to build an AAA game tha

I agree, whenever something claims to be "pretty much invisibly to the application", it means the abstraction is going to be too costly to build an AAA game that runs at 200 fps on modern hardware. There is a reason why DX12 is the framework of choice for 99.9% of the industry.