Yeah, processing LiDAR, GPS-tracks and other sort of GeoData using GIS in our days is very handy and mostly decreased needs in "old-school" cartographers.
But, in the future "old-school" cartography would be some sort of art, such as B&W film photography now.
Also, painting using pencil & paper still popular by artists and now old technique mostly combined with draw in image editors, but last not fully replace pencil & paper. So, I'm not sure that now there are only 20 artist who use pencil & paper around the world.
Number of such professional artist really decreased in last 20 years, but PC and mobile image editors give chance to draw art for many users, that not paint before or lack experience with pencil & paper.
I know Esri runs a free one every now and then, it would be interesting to see how much of the teachings from different sources align with one another. Maybe once day there can be an open standard for cartography!
And you can't do nothing with it in offline.
PDF book is much better, as it fully acceptable without Internet. And downloaded book not require any registrations.
FTR, I would recommend to try OpenOrienteering Mapper app (desktop publishing software for cartography) if you need free & open-source tool for draw orienteering maps (or other types of vector+raster maps) and prepare it for printing or export it in many different raster and vector formats (powered by GDAL lib), including PDF with CMYK or Spot color separation.
Mapper sources available on GitHub and binary builds provided for Linux, Mac OS, Windows and Android (including Android-x86).
"A YEAR OF GOOGLE & APPLE MAPS - How much do Google & Apple Maps change in a year?"
Also, this book is not free and not available as PDF.
A much recommended activity by the way. Your local orienteering club will probably have open runs every weekend where everyone can just show up.