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Mocks and adaptations such as localstack and serverless can be equally leaky or incomplete. You don't really know until you hit the real stage if what you've got is ready.

I've had issues with LocalStack in the past.

Decided it wasn't worth the savings compared to running against the real AWS services.

Depending on how far in the past that was it might be worth it to revisit. Especially in the last year lots of things have changed.

anecdotal evidence

by default they have it so S3 requests with wrong headers are still sent

I didn't know this and one day I changed the send header but not receive header

Turned out the cache-control was wrong when uploading an image to a presigned url, but this was never caught until it hit staging env since local tests and CI/CD tests showed a pass

"Please don't post shallow dismissals, especially of other people's work. A good critical comment teaches us something."

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