If you are that knowledgeable person in this domain, try to refute/discuss my content instead of asking my credentials. What is the best alternative to Vulkan

If you are that knowledgeable person in this domain, try to refute/discuss my content instead of asking my credentials. What is the best alternative to Vulkan extensions in your opinion? Remember that Vulkan supports vast number of devices. I think that making featureset mandatory for all devices is not sensible approach here.