people use R for much more than data visualization, doing regressions, fitting SVMs, decisions trees, GARCH and ARMA time series models, isn't really trivial in

people use R for much more than data visualization, doing regressions, fitting SVMs, decisions trees, GARCH and ARMA time series models, isn't really trivial in javascript. also ggplot, while more limited is way easier and faster than d3 for doing the specific things that ggplot is good at. But for statistics, that's usually what you want