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Ethereum’s next big argument isn’t about speed, fees, or rollups. It’s about restraint. In a recent post on X, Ethereum co-founder Vitalik Buterin warned that years of additive upgrades have turned protocol complexity into a structural risk. His point was simple, almost uncomfortable: a blockchain can look decentralized on paper and still fail its core promise if it becomes too complex to understand, rebuild, or independently verify.
Buterin’s critique targets a pattern baked into protocol governance. Backward compatibility shapes how upgrades are judged. Changes that add features feel safer than changes that remove them. Over time, that bias accumulates code, rules, and cryptographic dependencies. The result is a protocol that only a narrow group of specialists can fully understand.
In his words, complexity weakens three pillars. Trustlessness erodes when users must rely on experts to explain how the system works. The “walkaway test” fails when new teams cannot realistically rebuild high-quality clients if current developers disappear. Self-sovereignty fades when even advanced users can no longer inspect the system end-to-end.
An important, and perenially underrated, aspect of "trustlessness", "passing the walkaway test" and "self-sovereignty" is protocol simplicity.
Even if a protocol is super decentralized with hundreds of thousands of nodes, and it has 49% byzantine fault tolerance, and nodes fully… pic.twitter.com/kvzkg11M3c
— vitalik.eth (@VitalikButerin) January 18, 2026
This is not a theoretical concern. Ethereum’s codebase now spans hundreds of thousands of lines. Each additional component increases the number of ways the protocol can fail. Security becomes harder to audit. Client diversity becomes harder to sustain.
Buterin calls for an explicit simplification function inside Ethereum’s development process. He describes three measurable goals.
He points to three goals: reducing total lines of core protocol code, limiting reliance on complex cryptographic primitives where simpler constructions suffice, and adding clear invariants that constrain client behavior.
Ethereum has already done this before. The 2022 transition from proof-of-work (PoW) to proof-of-stake (PoS) removed an entire class of consensus logic. More recent changes also point in this direction. EIP-6780 in 2023 curtailed the self-destruct opcode, narrowing how state can change. EIP-7825 introduced a per-transaction gas cap, a change that makes execution limits more predictable for zero-knowledge systems.
These weren’t cosmetic tweaks. They cut ambiguity. Ambiguity is where bugs and exploits tend to hide.
Buterin also outlines a softer approach. Rarely used features do not need to vanish. They can be demoted. Under this model, legacy behavior moves out of the mandatory protocol and into smart contracts. Client developers then focus on a smaller, cleaner core.
Examples include retiring old transaction types once full account abstraction is live, or replacing most precompiles with virtual-machine code. He even raises the long-term option of moving beyond the EVM itself, while preserving it as contract logic.
This view contrasts with other networks. Solana Labs CEO Anatoly Yakovenko has argued that constant iteration is necessary for relevance, even without a single steward guiding change. Buterin’s stance points the other way. Ethereum, he suggests, must slow down after its experimental phase.
I actually think fairly differently on this. Solana needs to never stop iterating. It shouldn’t depend on any single group or individual to do so, but if it ever stops changing to fit the needs of its devs and users, it will die.
It needs to be so materially useful to humans… https://t.co/itqr1b5az4
— toly 🇺🇸 (@toly) January 17, 2026
The argument is not anti-progress. It is about durability. If Ethereum aims to function for decades, deleting features may matter as much as adding them. In that frame, garbage collection becomes governance, not cleanup. Governance, done right, is what keeps systems alive after the hype fades.
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