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So it's cheaper *on AWS*. Any cloud provider where cross-AZ traffic is not $$$, I can't imagine this architecture being cheaper.

Engineering solutions which only exist because AWS pricing is whack are...well, certainly a choice.

I can also think of lots of cases where whatever you're running is fine to just run in a single AZ since it's not critical.

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The other clouds have fees like this too.

Even if this were to change, using object storage results in a lot of operational simplicity as well compared to managing a bunch of disks. You can easily and quickly scale to zero or scale up to handle bursts in traffic.

An architecture like this also makes it possible to achieve a truly active-active multi-region Kafka cluster that has real SLAs.

See: https://buf.build/blog/bufstream-multi-region

(disclosure: I work at Buf)

I think Azure eliminated their inter-availability zone data transfer fees last year. https://azure.microsoft.com/en-us/updates?id=update-on-inter...

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