Why everybody is doing blochain?

I feel the world is already doing good.
Our internet speeds are good, hospitals are doing good, insurance is working and so are the schools, flights and education

Why there is so much hype about blockchain and decentralization all of a sudden?

If insurance industry or banks are storing the transaction information in a central database/system and its been working fine so far and there is no double spending problem
, how would making it decentralized help so much?
Atleast from end user/customer it really doesnt matter as long as the information stored is accurate and transactions are going fine (which is already happening)

Agree that in the past, lot of hacking attempts happened (the big retail store credit card, credtit rating hacked etc) but these problems would still exist even if we do blockchain

May be I did not understood the concept of blockchain. Does anything changes drastically for me, the end user?
I would be still going to website to book my flight tickets or go to centers to write exams or get my insurance claims or be dependant on the banks for withdrawing my money etc
Please provide any links or articles to read which explains it in layman terms on what is really changing and what the sudden splurge of devs/companies are really doing