>>5273510>>5273514Looking it up myself, it does seem that the canon Motive Force does indeed focus primarily on electricity and thus the Electro-Priests focus on it. Which makes sense given the mechanical and bioorganic nature of machines and life. It also sorta makes sense given that pretty much the vast majority of the processes of life are reliant upon the fundamental electric force (all bio-chemical reactions are based upon the exchange of electrons in atoms)
So linking the Motive Force's understanding to a primarily electric nature is sound.
Personally, I think there is room to expand upon it from a theological perspective.
There are, to current human understanding, four fundamental forces. One of them is electricity, but there is also the gravitic force, and the strong and weak atomic force. Without gravity, there would be no movement of planets about the stars, without inertia there would be no movement at all. And without the atomic forces, the precious life giving power of suns and stars would not fill the black void nor would the nuclear batteries that power so much of our technology function.
For now linking the motive force to mostly the electrical variety is fine. Maybe Talos could extrapolate upon it one day. After all Grav-Tech and Rad-Tech are also big in the Mechanicus.