What broadcasters use is not relevant to how consumer video encoding offload chips function.
You think broadcasters use one of nvenc (Nvidia), Quick Sync Video (Intel) or Video Coding Engine (AMD)? Evidently not, as you know they use high end hardware encoders like DVEO that bake the algorithm in to silicon.
I clearly stated that I was talking about consumer hardware video encoders, and I'll repeat it again: for a given bitrate, software encoders produce higher quality output than consumer hardware encoders. The only thing that consumer hardware encoders do better than software encoders is speed.
If you are arguing otherwise, and don't want to appear foolish, an hour spent reading doom9 might help.