The base OGL (SRD5) also doesn't cover a lot of races, classes and subcalsses, many spells or most feats - this is why a lot of that game's races are custom-to-world, and their subclasses are not the same, etc.,
Oh, right, for sure. I guess I don't really consider those part of the "prime rules" so to speak. I expect them to change based on setting.
Example : SRD (free to use) has 1 single Feat. One. :P