first things first, it is important for us to understand what onion-like stands for.
just like an onion, an architecture must have a lot of layers...
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From the headline, I thought I would completely disagree. But your recommendation regarding small teams is of course a totally valid one. Have you heard of the sliced onion architecture? Seems to be a good middleground between well-structured, domain-driven architectures & start-up-like simple architectures.