Most of the things that claim to be decentralized, aren't decentralized.
That's right. Most people I hear talk about decentralization, from their words, know little about how things really work. How the internet works and how they can access information.
Most of the people calling for
decentralized everything obviously don't understand the complexities of decentralized systems or the realities of internet communication. They often have unrealistic expectations about what decentralization can achieve and overlook the potential drawbacks.
Centralized databases do seem to be efficient and scalable, no doubt about it. But, distributed data systems have some stuff going for them too. Redundancy, fault tolerance... Still they don't seem truly decentralized since they still have some kind of centralized control mechanism happening under the hood.
I figure centralized databases are gonna keep on being the main way we store data for a while. People stick with what they know works decently enough already.