Your skepticism is valid and if your flow already includes: A secure messaging tool (e.g. Signal), a GPG workflow or local encryption or a team that uses shared password vaults. Then to be fair Stasher might not be better.
I built Stasher for me. I wanted an easy, CLI-first way to share one-time secrets without worrying about accounts, apps, or trust. If Signal or GPG works better for you that’s totally cool.
Stasher exists to make casual, secure sharing simpler not to replace tools you already trust.