Vitalik Buterin acknowledged that the decentralization framework is still a sketch, with assumptions and figures yet to be finalized

Quotes that support claims

This is a sketch with numbers still to be filled in, and even some of its underlying assumptions are perhaps disputable (to give one example of many: FOCIL has strong consensus within some circles, but other circles have barely even started thinking about it - and if we don’t do FOCIL, that has implications for optimal block buildin

He also acknowledged that these ideas are still preliminary. Key figures and assumptions are yet to be finalized, and certain components—such as FOCIL, a proposed mechanism for fast block inclusion—remain under debate. While some in the Ethereum community support it strongly, others have yet to engage with the concept. If FOCIL is ultimately not implemented, that decision could influence the network’s design strategy, particularly around optimal block construction.