VAO and maybe more things that I don't even know about... I might be able to reimplement those in OpenGL ES 2 but I think OpenGL (ES) 3 is a good middle way bet

VAO and maybe more things that I don't even know about... I might be able to reimplement those in OpenGL ES 2 but I think OpenGL (ES) 3 is a good middle way between old stuff and over-engineered Vulkan, DX12 and Metal for dense but still ok performance and cross platform (mobile/PC) support.