There most certainly are reasonable use cases for what blockchain fanbois think blockchain does
... only the blockchain itself is utterly unnecessary in every single one of them.
There is one real and useful thing that utilizes the principle on which blockchain is built. The thing is called Git. It works, pretty well at that, and its working principles are very easy to understand which makes it appealing, transparent, and bullshit free. Which, sadly, can't be said of the whole blockchain "ecosystem" (I would like to, ahem, coin the term blockchain biotope, which I believe better describes this crock of rubbish in which there is no system and with electricity requirements similar to those of a ten million nation is completely anti-eco).