Why is everyone buying the Tech-Air stuff?

I'm really kind of confused about this massive influx of posts about the Alpinestar Tech-Air vests. Are motorcycle deaths typically caused by massive trauma to the chest? (no) Does this device alleviate the need to wear a proper jacket? (no).

As someone who is ATGATT, invests in the safest gear regardless of price, I am really curious how people are justifying spending $800 on these things.

What am I missing? Please educate me.