To be fair, in modern GL versions they fixed some of these things. In GLES 3.1 which I used a lot on Pi4 https://github.com/Const-me/Vrmac/ GPU vertex buffers and shaders worked fine, GLSL compiler in the drivers worked fine too.

However, others issues are still present. There’s no shaders bytecode, they have an extension to grab compiled shaders from GPU driver to cache on disk, but it doesn’t work. The only way to create shaders is separate compile and link API calls. Texture loading and binding API is still less than ideal.

To the point that even Carmack changed his opinion on DirectX.