This 5453 solves a different problem. Namely, approval of specific method calls.
This saves round trips for separate transactions so it close to batching.
But batching is only one feature of 4337 .
With 5453, You must sign with your account, so it “enshrines” eoa accounts.
EIP 4337 is about accounts, and about abstracting them, so that any account can have it’s own execution model, signing model, recovery model, replay mechanism and also different gas model.
In addition, we define the rpc and protocol used by users and nodes to communicate, and make sure UserOperations are as decentralized as normal Ethereum transactions.
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