No doubt core failure is a liability that i minimized but still exists. In my case i had 10 awg stranded and 12 awg solid. The solid had less resistance. The stranded was high quality rc stuff with thick silicone jacket.

its not for everyone and I’ll keep an eye on resistance and a broken core. The nice thing about solid core is that you can bend it and it holds its shape so you can creep around fans and keep it off the motor. i control vibration with bends and support. One thing that is a little different than stranded is the solid core wants to hold its shape so if the bend or connector approach isnt right everything wants to push away from each other.

battery wires are stranded for sure but tucking a solid core under a top plate from the battery to the esc input power seems to work out.