If someone wants to rob you of all your bitcoin, they can hold a gun to your head until you give it to them. A bank, on the other hand, has transaction limits.
If I buy something online with a credit card and soon after discover it's fraudulent (which has happened to me on multiple occasions), I can reverse that too.
But what we want is that once transactions are recorded to a ledger, that it's not possible to remove that record.
This durability is a highly valuable property for financial transactions and other things where non-repudiation is desired. However, it's a possibly scary property, too (what if something copyrighted or illegal ends up in the forever-durable and public ledger?)
A "revolution". They just applied SSS. Hardly rocket science.