With the advent of EIP-7702, it is possible for Externally Owned Account (EOA) to perform atomic batched executions.
We anticipate that there will be multiple EIP-7702 delegation accounts from multiple vendors. To enable frontends to be able to detect and prepare a batched transaction that works across multiple vendors, we will need a standardized interface for batched executions.
In the absence of such a standard, the vendors may choose to create their own proprietary implementations, causing ecosystem fragmentation.
This standard propose a minimal batch execution interface that is easily implementable, extensible, and performant. It also includes a signalling function for tell frontends that the account supports the standard.
Reference Implementation
A optimized implementation is available in Solady.
The ERC proposal has a more readable implementation.
I like the minimal approach of the ERC, and I believe it can be a default minimal batch execution interface not only for EOAs via ERC-7702 but also for other ERC-4337 accounts.
For example, a simple ERC-4337 account may implement ERC-7821 instead of the IAccountExecute interface. I see it was recently changed to allow msg.sender to be the entrypoint, which is great.