Just had a quick thought, we’ve assumed that the point of myelin is insulation of signal under the electric brain construct. As I’m currently not very hot on that construct (to the point I’m extremely certain it’s an inaccurate understanding of mechanics), what if the actual mechanic of myelin is to perform metabolic sustainment of the signal and continuous sampling/strength feedback of the signal? The sheath doesn’t so much protect the inside from the outside, as much as it keeps the signal timing and strength properties consistent where they should see significant fall off in a true electrical environment as messy as a body.
I guess a good analogy would be the sheath acts more like a third rail for a subway/train system than an insulator of electrical signal.