Articles like the "AI + Blockchain" one are meant to be forward-looking, to help inspire people to build. Call it hand-wavy if you wish; I call it laying out a vision:)

But we're all about real apps getting built. Many comanies are building on BigchainDB. For example, I describe some of them here: https://blog.bigchaindb.com/where-does-blockchain-scalabilit....

There are many, many more companies that have not publicly announced what they're building yet. Stay tuned:)