This. I've read many accounts of people advocating for use of blockchains in industry or government, which mostly boil down to different entities emitting documents in a verifiable way, e.g. for property ownership. As you've said this can be handled using boring PKIs and the like.
Emphasis on "seem". These aren't even problems in the practical sense, but rather tools you can use to solve concrete problems. And in many cases, you can use similar tools that don't involve blockchains (merkle trees, FSS+PKI, …).
And it's still not clear whether blockchains can in practice deliver on the promises of decentralization: There's no good solution to problems like 51% attacks, other than rallying behind a central authority like the chain's developers. Why even bother with a blockchain then?