Phone numbers are easy to leak, scrape, and spam. If a messenger requires your number, anyone who has it can often try to reach you.
Locksee flips that. Your public handle is a QR code you choose to show. Scan to connect. No directory of numbers sits in the middle.
That does not replace encryption — it sits on top of it. Encryption protects the content. QR identity protects how people find you in the first place.