Decentralization is either a very attractive feature or a dangerous threat. It depends on who you ask and what they have at stake.
I think decentralization is a very attractive feature. But there are many problems with various blockchain-type technologies currently. These problems include high energy costs, slow and limited transaction rates, lack of privacy of transactions, and being too complicated for any average person to use safely.
Not all blockchain technologies have all of these problems. There are many mitigations for these problems. Some people say that some of these issues (like irreversible transactions) are features, not problems.
One way of seeing it is that the current technology is just a a low-level base layer, and better things will be built on top of it.
But, currently I'm not aware of any widely-accepted cryptocurrency or blockchain tech which avoids all of these problems yet.
Edit: and isn't good old physical cash still a reasonable solution in Spain?