Something simultaneously too obvious to point out and too deep for some people to understand is that the finance industry cannot by itself create any value (thread)
There are certain things which are ends unto themselves: food, clothing, shelter, extended lifespan, and even entertainment don't require justification for their existence. If they are made something of value has been produced.
Other things only exist in support of those things: finance, legal, and management are not ends unto themselves. If everything produced next year were exactly unchanged but it were done with 50% less lawyers the economy wouldn't be smaller, it would just have less lawyers.
There are some things like computers and transportation which aren't technically ends unto themselves but close enough to the underlying thing that there isn't much concern over whether there's something there.
Management is a very different beast. In large companies there's a very real question of whether the layers of middle management are providing any value at all, and in many cases the answer is no
In finance this applies even more. There cannot be a money perpetual motion machine which keeps going up without aiding some real world value creation. Throwing in the words 'decentralized' and 'blockchain' doesn't answer the question of what it does.