Fair points, but from what i know, those applications you mentioned remains centralized, ended up failure or don't use blockchain (only used as buzzword to raise hype).
IMO those applications can indeed be used decentralized.
The supply chain, for example.
You would be able to track the harvesting of the cottage, the transport via ships, the creation of yarn and finally the manufacturing of a shirt completely transparent.
There are multiple entities involved in such a process. And with a blockchain tracking all of these steps, there would basically be no central authority.
Yet, there is not a single project which does that.
Anything one can find at the moment, indeed just uses blockchain as a buzzword. But i am confident that we can have several applications backed by a blockchain in the future which have absolutely nothing to do with cryptocurrencies.