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> It's never late to learn Vulkan / DX12 after learning learnopengl.com!

Why would you do that? Why would you want to learn an API for graphics cards from the 90s instead of an API for the graphics card from the 2010s?

> The value of learnopengl.com isn't in the APIs, it's about learning the basic concepts of graphics programming.

Then you should learn concepts of graphics programming that isn't defined with code snippets like

    #version 330 core
    struct Material {

> And you'll probably have to unlearn Vulkan and DX12 again once a new API has surfaced

Strange. You "have to unlearn a newer API when an even newer one has surfaced, but you should learn this ancient API anyway".