The reality of the situation is that blockchains are a mostly useless and inefficient datastructure that by and large don't solve any real problems. I find it insulting that I can't say this without someone labeling me a "nocoiner." Yes you can make money with them, that isn't the point. Sometimes an algorithm can just be bad. If you can't look at an algorithm objectively, maybe consider that you're not trying to discern the reality of the situation?
'blockchains' (the ecosystems generally, not the datastructure specifically which wasn't the innovative part) solve the problem of arbitrary, mutually unknown individuals making transactions about things of value. They're pretty much the only way we know to solve that problem.
Of course, humans have been around a long time and had to manage before the bitcoin white paper, so most problems where the best solution involved arbitrary, mutually unknown individuals making transactions about things of value have either been ignored and are considered 'not that important' or have been solved 'better' through the creation of trusted third parties (which doesn't solve the problem for truly arbitrary participants, just moves it), or just forcing the risk onto others who previously had no choice but to accept it. This point of view is mainly just because society has had thousands of years being built around a constraint that the publication of the bitcoin whitepaper removed, and it takes a certain amount of imagination to see the possibilities.
When you think about blockchains, you should be imagining what they enable: nonpermissioned (so even foreigners in war zones, or the homeless can take part), access to an international network that allows cross-party transactions dealing in hetrogenous kinds of goods. The network is by default API enabled and compatible (so I can write a smart contract that uses other smart contracts). It uses modern cryptography (unlike many Banks). Because it allows transactions across organisations and assets, things like flash loans where a loan can be made at zero risk to the lender (because the capital must be returned in the same transaction) are possible, something that is entirely impossible in traditional finance. They enable immediate transactional settlement, which is also hard in traditional finance (how do we swap something so that at no point one party has to take on the risk of the other party not delivering?). They enable groups of people that don't know each other to pool their money. This was impossible in the past without a trusted governing body that would incur costs and therefore need to take a cut.
In finance, the main strategy up to now has been to register a corporation with multiple governments, spend lots of money on large marble buildings and conservative (i.e. non-innovative) smartly dressed staff for hundreds of years in order to give a sense of solidity and trustworthiness. Sure, it works, but that's what's really inefficient.
