Or double-entry book-keeping. This is an data pattern that predates electronic computing by centuries. Any time I'm delivering a user experience that involves

Or double-entry book-keeping. This is an data pattern that predates electronic computing by centuries. Any time I'm delivering a user experience that involves work-in-progress or benefits from any kind of history, I reach for event sourcing. Turns out that's a majority of business processes, at least in my customer sector. I've found it straightforward to implement and realise the benefits of ES & CQRS in isolation. Complexity arises from assumptions of RDBMS/REST semantics in underlying frameworks or connected services.