Nobody mentioned the biggest reason. True functional programming coupled with type checking leads to more modular programs with significantly less bugs. I don't

Nobody mentioned the biggest reason. True functional programming coupled with type checking leads to more modular programs with significantly less bugs. I don't know about ReasonML, but a similar framework called ELM delivers Zero run time errors. Zero. Languages that eliminate entire classes of errors from type errors to run time errors should be the future evolution of programming languages. React+redux was only a small step in the right direction.