Blockchain was a real technological breakthrough back in 2008. A new milestone in the world of money, security, e-commerce, and the Internet as a whole — it is literally everywhere now, and modern business utilizes it worldwide. The idea of recording the information without any ability to change it afterward was brilliant. Firstly, as you know, it was implemented in the first cryptocurrency, Bitcoin, but later, it came to banks, security providers, insurers, farmers, governments, etc.
Why were people so obsessed with the blockchain? Because this system guarantees that no one, no matter how powerful or rich this person is, can tamper with the information encoded within the public ledger. Yet, even the sun has dark spots. With time, people have realized that this system is not ideal, and there are problems to be solved. For example, the ledger gets heavier and slower with every new transaction, as the blockchain grows. Or, it cannot exist without miners, and thus — the fees are inevitable.