Arguably these are sort of the same thing. Being subject to the whims of the committees is a competitive disadvantage, since the committees are largely controlled by big corporate players. So if you create a new competing standard you control, it's 2-for-1: Not only are you no longer subject to the whims of big companies, but you get to set the rules.

One of the upsides to using the big committee standards is that the big companies often have a reference implementation you can use, which is a time-saver. But then you can hit sharp edges or limitations.