Horses for courses.

The difference between someone who knows a computer language and can write a computer program, and an experienced, talented, skilled, developer is that the skilled developer is able to look at a particular use-case and determine the best (or at least a very good) option for how to implement it.

There are situations where a centralized database it the best choice. There are situations where a decentralized blockchain is the best choice. Anyone who blindly chooses one over the other without considering the benefits and requirements is a fool.