Note that dietlibc is the project of a sole coder in the CCC sphere from Berlin (Fefe). His main objective was to learn how low level infra is implemented and started using it in some of his other projects after realizing that there is a lot of bloat he can skip with just implementing the bare essentials. Musl has a different set of objectives.

I follow diet but it is definitely not ready for general use like musl and probably never will be. There aren't a lot of eyeballs on it.

That's what I'm saying. It's not Fefe's objective to make it fit for everybody...