While highcharts only help with Graphing, we can always show the same data below charts on a grid so that the readability is significantly improved. Also no one can handle millions of rows of data incrementally in a very optimal manner (but highcharts can do it). So it will be great. See some examples here

https://www.ag-grid.com/best-javascript-data-grid/index.php

this is very difficult product to use as compared to highcharts. So a grid control built just like all the other charts will be very helpful

why not :)