Except blockchains are incredibly complicated, and as the hacks have shown, programming on the blockchain is a great way to create a bug bounty that also shuts down your company
Definitely, blockchains aren't secure in the way that many Ethereum apps seem to think they are.
But for certain types of lower stakes applications (say a log running on a mesh network of sensors) blockchains can provide a simple way to do something that could otherwise be fairly complicated. Certain blockchain implementations (I like MultiChain) are really easy to use.
