No, not at all. There are many people that do in fact use GNU/Linux to program and develop applications for various operating systems (not just for Linux) but GNU/Linux is easily used by many people of all levels of computing skill.
PureOS is designed to be user friendly by utilizing one of the most popular desktop environments available called Gnome 3. Gnome 3 works well with both touch and traditional mouse and keyboard user inputs to allow for easy use. The Librem has well known traditional ports and utilizes off the shelf parts for easy replacement if something needs replaced.