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So, what is the killer app of faas? To my layman understanding the selling point is easy scale-ability, but it seems to be inherently at odds with serverless being the most expensive computing model?

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Not necessarily; what matters is how peak-y the demand is. For example, my country's teachers portal gets orders of magnitude more requests during a couple of weeks of the year than the average (at the start of the school year). Going serverless for those processes might make sense.

IMO, every greenfield app that can benefit from "just focus on your business code" model.

P.S. I'm the author of OP, thanks for reading!

This is an argument for buildpacks, isn't it?

Disclosure: I am currently working on buildpacks again.

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