Why do so many people misunderstand blockchain, specifically decentralization?
Preservation of data forever, transparency, and the absence of a central authority are criteria for decentralization in financial systems and are not a general term for all central problems.

Blockchain is not a magic solution for all problems, and one of the disadvantages of decentralization is slowness, a feature that centralized platforms have.

Suppose, for example, that you want to hold a conversation with someone who is expensive and you need to wait for several minutes before you can get a response, would you use that service?

The above does not mean that decentralization in messages cannot be applied, but we need to define the term decentralization.