it let you decentralize trust. as one example, I was hoping that as well as "sign in with google" I could sign in with a blockchain based decentralized identity service where nobody could one day decide to revoke my identity on a whim.

i remember my friends excitedly telling me how cross border container trade is still done with paperwork because nobody trusts each others' IT systems. I'm pretty sure it still is because they can't be convinced to trust blockchain systems either.

trustworthy voting is another application. ive yet to see a political party that runs an internal voting system that doesnt rely upon you trusting a central server run by a few people. this is crazy.