I don’t understand what problem web3 can solve that a trusted entity cannot. And let’s keep in mind your reply to this comment will be using a trusted entity. In fact in the history of the internet I cannot find a single example of any technology working better in a decentralized fashion compared to centralized for the end user
Hot take: The proponents of decentralized systems feel disenfranchised by those who own and govern centralized systems, therefore decentralized systems are their way around what they consider injustice. It is a grasp for control and power where they feel they have none. They don’t feel they have a seat at the table, so they argue for building their own table, which is, naturally, “superior” to the existing table (why…
These decentralised systems are a natural abstraction for so many different types of problems and systems. If you leverage them you can still get high performance systems in a centralised manner but the hard work making those systems resilient, localised, and highly available has already been solved. If you design your systems on top of this technical layer you can leverage the benefits without the costs of centralisation for the most part.
The other academic argument to be made is that this is basically the only industry that is meaningfully pushing cryptography forwards (IMHO). Concepts like Functional Encryption, Fully Homomorphic Encryption, Secure Multi-Party Computation, and Zero Knowledge Proof Systems have been primarily funded by cryptocurrency research and towards the application in decentralised zero trust systems (which are basically the "ideal" environment for exploring cryptography and game theoretic technologies).
Code doesn't fix people problems but it can augment existing systems and letting those systems evolve to their logical conclusions is a worthwhile endeavour.