Earlier quoted context omitted.
The only two known usage of blockchain that actually seem to offer a clear advantage over some other strategy (running the thing centralized, not having coordination at all, etc) are A) solving double spend (a la Bitcoin) B) solving zooko’s triangle (a la Namecoin, or the clone you mentioned from ipfs). Identity on blockchain beyond resolving zooko’s triangle (I.e. stably mapping pseudonyms to pubkeys) typically does…
Why does Bitcoin have a clear advantage in solving double spend over a centralized solution?
If you want to trust a conglomerate of folks who have a vested interest in keeping you small and poor to solve your problems, then there is no advantage. If you do not, then the advantage is exactly that it is not centralised.