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I thought OpenGL ES was just a restricted subset of OpenGL, and old versions of it at that. It seems kind of weird for them to be behind if this is the case so maybe I don't understand this correctly.

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Not exactly - it's more complicated than that (https://en.wikipedia.org/wiki/Opengl_es). GLES was originally a simplified spec based on the desktop API, but optimized for mobile and embedded devices. They have since leapfrogged each other and removed (fixed function pipeline) and added (shaders) various features at various times.

The latest versions of ES and GL are largely, but not completely compatible AFAIK, with the desktop having a superset of features.

According to https://en.wikipedia.org/wiki/OpenGL#OpenGL_4.3 OpenGL ES 3.0 is fully forward compatible to OpenGL 4.3.

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