The blockchain technology is a very good tool to store data. But I agree that we have too many useless projects today.
Blockchain technology is not only to store your date but it is something really decent to store your most valuable thing call bitcoin, now a lot of big companies are switching to bitcoin blockchain technology and big corporations are now working on it, many cons specially bitcoin is now using blockchain so what else we want.
i think blockchain technology is not useless, but there are conventional technologies that are not ready to accept the development of the tech world. we can see with blockchain technology provides many advantages so as to rival the technology of centralization