Decentralized planning doesn't work. Just use the plane analogy. Do you let you passengers decide the size and type of your engines?
But at the same time, do you only allow one single entity to design all planes?
In Bitcoin, no. Bitcoin Unlimited is still fighting for their case right? No one can shut it down and make them stop. It is their right. So with them or against them we should respect that right.
If another entity designs a plane, does that constitute a hostile takeover or a power grab in the aerospace industry? Surely it's healthier if multiple entities come up with their own designs and then passengers decide which plane they want to board based on their own preference.
Yes and no. In the case with Bitcoin there are arguments it is both.