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Why I Stopped Using MediatR and Built CQRS From Scratch in .NET 10 MediatR is a great library. I'm not here to trash it. But when it moved to a paid model for commercial use, a lot of teams — including mine — had to make a decision. And the more I looked at what MediatR actually does under the hood, the more I realised: this is not complicated enough to justify an external dependency. So I built