Tesla glass is a transparent metal, not a glass as most people think of it. As transparent metals are more conductive it would aid the vehicles design in attenuating EM energy along with the EM shielding exoskeleton & EM absorbing honeycomb battery configuration.
Another of the interesting properties of metals compared to glass and transparent plastics, is for example its high thermal and electrical conductivity. This makes it possible for example to create electrical circuits including transparent parts and many other applications yet to be discovered.