I find it very disrespectful towards a project with such popularity to contributors ratio.

It takes long hours to produce a working notebook, a synergy between concept descriptions and theorical explanations alongside code, comments of code and markdown for the theory here and there is an artistic coupled with engineering stunt you should try to accomplish yourself before criticizing. Perhaps you have, in which case a contribution as the other comment points out is the courteous thing to do.

That book must have taken months to author and is one of the best read on the subject I've ever come across.

Edit: removed incorrect fact about scalars.. they don't have a direction they have polarity.

My intention was to suggest that my parent shouldn't be so quick to criticize while acknowledging that they may have a point.

If the latter goal outshined the former, my apologies. I love stuff like this.