Vitalik stated in a reply to netizens on X: "Over the years, I have been discussing the need for lightweight clients (L1 and L2).
I believe that when @NoahCitron Helios (or an alternative) creates a convenient javascript library to handle things that wallets can easily import, solutions will emerge.
In addition, it is important for L2's configuration (config) to be transferred on-chain because this will make it easier for the lightweight client state proof verification function to become part of the configuration, making universal L2 lightweight clients possible."