PANews reported on May 7 that Ethereum co-founder Vitalik Buterin said on the X platform that the purpose of Plasma is not to prevent invalid/unusable state transitions, but to allow users with valuable assets to use the previous (valid and usable) state to exit when this happens, in a way that has self-consistent rules to prevent double exits of any assets.
Earlier in November last year, Vitalik Buterin published an article titled "The Exit Game of EVM Verification: The Return of Plasma", saying that Plasma is an underestimated design space and that proof of validity may solve the challenges it faces.