Vitalik Buterin advises against prematurely advancing Ethereum rollups to Stage 2, especially when work to move to stage 2 happens at the expense of work to harden the underlying proof system

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At the same time, however, it is a mistake to jump to stage 2 too quickly, especially if work to move to stage 2 happens at the expense of work to harden the underlying proof system. Ideally, data providers like l2beat should show proof system audits and maturity metrics (ideally of the proof system implementation, not the rollup as a whole, so we can reuse) along with the stage.