Subset yes, but GLES 2, 3 are fully shaderbased and suffice in my case.
The advantage is easier support in my crossplatform app.
OpenGL drivers are not a very sure thing on Windows,
that's why I go like the major webbrowsers (which use libGLESv2.dll for webGL
and others). The swiftshader software renderer libGLESv2.dll is OpenSource,
and also the speedier libGLESv2.dll Angle. This can be used as fallback
if a hardware driver (openGL ES or matching openGL) is lacking.