How is julia or it's type system not suitable for general purpose programming? Multidispatch seems like a generalization of python...and fields don't have to be

How is julia or it's type system not suitable for general purpose programming? Multidispatch seems like a generalization of python...and fields don't have to be typed. general purpose programs in julia: https://github.com/shashi/Escher.jl https://github.com/shashi/Escher.jl https://github.com/essenciary/Genie.jl https://github.com/essenciary/Genie.jl