[glaze]

Yup, I doubt he has experience working in the games industry. Many engines support multiple graphics APIs and there's often only 1-2 employees implementing/maintaining them so speaking about vendor lock-in is not a strong argument.

[shmerl]

How is that a counter argument to anything? The need to support multiple APIs is not free. It's a tax on everything else.

[glaze]

You're right that it's not free. But compared to the whole game engine codebase size the renderer backend is usually not big.