Compared to what? What gives you all that, and what prevents you from having it with tables?

Javascript arrays have functions for all of that, so if you use something like React and renders your table from data arrays then it's all pretty trivial. I guess the point is that if you have to use JS to do those manipulations, then at some point it's going to be easier to just the React(/Vue/Svelte/etc) approach than manipulating the table yourself using the API described in the article.

Frameworks that make development easy are inherently inefficient. If performance is priority, then you better sort it yourself.

countless plugins for use in countless frameworks. We should have all that built-in by now. like we finally have a functioning date picker.