They’re not, they’ve had the bZ4X for over around a year now. It’s kinda mediocre but certainly not the worst BEV I’ve seen.

Any idea why Tesla went against that to a shatter proof glass?

Because Elon Musk is a manchild who thought it was cool and forced his engineers to entertain his idea? The entire design of the Cybertruck just screams “someone high up had a shitty idea and told engineering they had a month to figure out how to make it real without any regard for rules or regulations”.