do we really need blockchain technology?
In case of Bitcoin. Of course, I agree.
What about ETH? I agree too.
But, have a look at the others on the market. I don't even know why should people use their service. There is no real use in real life.
If you dont need Blockchain, then you as well does not need cryptocurrency. Cryptocurrency cannot work without the blockchain and same blockchain; I havent seen any other thing one can do with blockchain apart from cryptocurrency. I have seen people say a lot of things that can be done with blockchain including message encryption, but none of those has been done yet. But as for cryptocurrency? Yes you still need blockchain.
Banks are also now adopting blockchain and they admire the reliable way to save money with the help of blockchain as its well developed technology.
There are hundreds of industries start making use of blockchain technology but unfortunately OP is against it due to serious of bitter experiences with lots of scammy coins/projects. He must understand that due to few wrong examples, we cannot ignore a versatile new invention.