Bitcoin is fully decentralised, that's why nobody can change it, but Eth, Polka, Ada, Ripple, etc are controlled by small bodies of people. That is the definition of "centralised control".
For instance, the SEC would not be able to sue Bitcoin, like they have done to Ripple, because with a decentralised currency like Bitcoin, there is nobody to sue. It is fully decentralised.
As far as i know that EIP can be created by anyone but that will need agreement from all parties to deal with the next EIP that will be implemented. I don't even think that already controlled by the small group.
Did you know bitcoin SEGWIT? that scalability solution already implemented to the bitcoin by bitcoin core.
When all of the miners agreed and the improvement proposal can be implemented.