This little subthread is a great example of a kind of fallacy that seems endemic amongst blockchain believers. "A blockchain solution X can solve problem P, therefore blockchain is useful". Without asking if there is a non-blockchain solution Y that can also solve P, and if so, what the relative merits of X and Y are.

Given that a blockchain is just a distributed database with a distributed certification mechanism, you can generally immediately construct a couple of non-blockchain solutions by first removing distributed certification, then distribution of the database itself. You can then quickly see the eigenmerits of those kinds of distribution for the problem at hand. I have yet to see an example where they are positive.