Such a process means that the user is onboarded directly into Layer2 as opposed to the Layer1 onboarding we're accustomed to. This could be a significant innovation because it would be one of the things that make mass adoption of blockchains possible. Imagine a sudden, large influx of crypto newbies who have just heard about a cool new dapp. Today, such a crush of new users would create congestion on Mainnet, driving up gas prices, increasing delays, and hurting other users and dapps (perhaps including important DeFi projects). If instead these new users were onboarded directly into Layer2, their arrival would be barely noticeable.