If it’s known some kind of decision making, so to speak, was happening via electrical signals in the spinal cord… why is it suprising that it happens in other types of cells too?

Neurons can do more operations than normal cells.

If I can make a bad approximation:

* Making circuits with normal cells is like making circuits with resistors and capacitors.

* Making circuits with neurons is like adding transistors to the mix.

(Please don't take this analogy too seriously, probably biologist and electricians are writing angry replies now.)

you are making sense with it, here read this:

Electrically Excitable Cells

https://neurotext.library.stonybrook.edu/C4/C4_1/C4_1.html