Partly true, but visualizing timeseries is full of little details and gotchas, and taking care of all of them on top of standard d3.js is quite a big chunk of w

Partly true, but visualizing timeseries is full of little details and gotchas, and taking care of all of them on top of standard d3.js is quite a big chunk of work. There's a lot of value on higher level libraries that make opinionated decisions how e.g. gaps, data point highlights, zooming, rounding, axis labels and tons of other details work.