It's not so much a modern API but a modern feature set. Most ANGLE backends give you an ES 3.0 context (except for 3.2 on Vulkan, so the problem is mostly Apple

It's not so much a modern API but a modern feature set. Most ANGLE backends give you an ES 3.0 context (except for 3.2 on Vulkan, so the problem is mostly Apple), and all of them lack some useful extensions to narrow the gap between ES and the desktop APIs.