Here's my suggestion. They are wrong, however, The Sons of Ether do have a theurgy, but they call it Lab Research and Scientific Method. For mysticks, theurgy trains them in the use of their paradigm of magick. Through various rituals, mysticks gain confidence that their paradigm of reality is valid and refine their command of its methods. The rituals of technomancers take the form of experiments.
Engineers don t just pull new devices out of a hat.
They have to understand how a device will work and how it should be built. Through such experiments, a scientist gains confidence in her ability to reliably control natural phenomena. To use a real-life example, lasers were not invented by someone deciding, Today I will build a death ray. Instead, lasers came from scientists investigating how electrons absorb and emit light when they jump between energy levels. Most of his lab time, therefore, will be spent on experiments designed to confirm his pet theories.