There is something else that blockchain does that I don't often see people talking about, or they do talk about it, but they don't seem to quite understand it fully.
Blockchain solves the platform problem. Finance needs a platform. Right now, there are a myriad of broken, old, difficult to upgrade systems that prevent basically any significant innovation from taking place in the payment transfer landscape. This has been commented on a lot. But I think it's important to step back a bit and understand why that is.
Finance is dominated by extremely large, extremely risk averse institutions, that all compete with one another. Any one of them certainly has the resources to develop "the app store" for finance, but the problem is that all the other ones are incentivized not to adopt it. JPMorgan doesn't want BofA to own the app store for finance, and so they will never integrate with it.
This is, fundamentally, a tragedy of the commons. All these big institutions, and all of us customers would benefit from some unified, universal financial platform. But nobody can build it, because every actor in a position to doesn't want to accept anyone else owning such an important choke point.
So what happens? Well, we get standards imposed by the only actor in the space powerful enough to create something like this: governments. Governments are, in general, not great at this sort of thing, and they certainly aren't very fast moving, or responsive to consumer demand.
This, is the problem that blockchain solves. We all know that anything you can do on Ethereum you can do in a relational database 1000x more efficiently and better. Better in every way except one: Ownership. Any traditional relational database is going to be owned by someone. Public blockchains are owned by no-one. JPMorgan can build applications on top of Ethereum or Bitcoin, not because they need its technical capabilities, but because Bank of America doesn't own it.
This is the critical insight to understanding why this stuff is important and valuable. It solves the coordination problem imposed by platforms. Platforms have tremendous value to users and efficiency, but they confer far too much power upon their owner for any financial institution to use a platform owned by another. The ability to make a 'financial commons' that is not owned by any one institution, government, or entity is what makes this technology powerful and useful.