Productivity isn't really the benchmark for LibreOffice, at least not until they're close to 100% compatible with the latest version of Office. Compatibility with everybody else's bizarre, overcomplicated, crappy files is the benchmark, and they use a hell of a lot more features than WordStar ever had.

I'd prefer to have a product with a crappy UI that can interoperate with everybody else seamlessly, than one with a great, simple UI that can't.