Eh, I’m personally completely fine watching content in other languages and so is pretty much everyone I know. I would never want to limit myself to content in languages I understand. Actually, I think the majority of stuff I watch is foreign content.
But to each their own of course and I guess it couldn’t hurt if they added the option, but I think expecting it as a “fundamental configuration” says more about you than about how bad Netflix is. There are much better arguments for that.