Well...you need to look at the numbers first, then make a decision.
Over 80% of violent crime is committed with firearms that can be stopped by the 2A
92% of violent crimes
Stats here:
Civilian Guide to Buying Bulletproof Body Armor - The Self Defense Training System
Truth is for everyday wear - soft armor is still the way to do.
You're not going to throw on 21 pounds to go get a bottle of milk. It's just not practical and not what people are going to use.
Also - 21 pounds is A TON. We have a stand alone Level 3plus plate (composite) that weigh about 1.5 kg each. We're releasing it with our new backpack.
And we're working on a plate carrier version for the bodyguard jacket line. I'm waiting for the prototype from the factory - the last one made me look pregnant and hunchback.