Blockchains: How They Work and Why They’ll Change the World
From the article:Can a blockchain find people offering rides, link them up with people who are trying to go somewhere, and give the two parties a transparent platform for payment? Can a blockchain act as a repository and a replay platform for TV shows, movies, and other digital media while keeping track of royalties and paying content creators? Can a blockchain check the status of airline flights and pay travelers a previously agreed upon amount if their planes don’t take off on time?If so, then blockchain technology could get rid of Uber, Netflix, and every flight-insurance provider on the market.Really?  All these applications can also be built using 'normal' systems architectures. If you build them on a blockchain, then you also get:   - A very low rate of transactions
   - A very high computational cost to mine new blocks
   - A very high storage cost for each node
   - No way to reverse transactions in the case of error or fraud

So somehow the benefit of putting these applications on the blockchain has to outweigh these costs.  The only benefit I can see is transparency. When you have information that must be publicly available and immune to tampering, then a blockchain could be a nice way to achieve that.But for these examples?  I don't see any reason to use Ethereum or a blockchain at all to implement them. Can someone help me out here?