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Seems like .net shops uses DDD+CQRS+ES by default. Don't ask me why.

It's not a requirement. But in general it's because it's 1 clean code path.

I don't think ES is as common as you think though. CQRS is.

What is ES? For those reading, DDD is Domain-driven Design, and CQRS is Command and Query Responsibility Segregation. But what is ES?

Event sourcing

Perfect, thanks!

Not from what I've seen, having worked across many many dozens of codebases, in various enterprises and also as a consultant.

Though yes there were definitely some influenced by Udi Dahan that use or aspired to use those.