Please illustrate how, by using a DTO, you can prevent an entire [MyType] from failing to decode when it has a missing required field?

At any rate, I never said that that was never a use case for a DTO. But like pretty much everything, it comes down to whether or not the benefits outweight the addtional complexity and code.

If you're creating DTOs for everything in an app by rote, then I'd ask why.