Sometimes the above involves signing a NDA with companies like Broadcom so they can't release useful documentation without having a lawyer go over it first, and

Sometimes the above involves signing a NDA with companies like Broadcom so they can't release useful documentation without having a lawyer go over it first, and nobody wants to bother with that. Even worse, they can't release the code and have to release a giant poorly documented and buggy binary blob to support things like 3D acceleration and video decoding. And yes, fundamental features may or may not work, like resolutions other than 1920x1080 as described in the article.