It seems like an appeal to hiring manager to me. "You'll have all the developers...

It seems like an appeal to hiring manager to me. "You'll have all the developers you need! Look, it's all javascript and everyone knows javascript!"

The problem is assuming language proficiency is the defining characteristic of a developer. We really need to disabuse management of that idea.

I'd rather teach a good 'microservice developer' javascript than teach a good 'javascript programmer' what makes a good microservice.