Well, when the first cryptocoin was setup, it had to be decentralized, because it could have easily been shut down if not.
Now . . . why bother to shut down a crypto currency, because all the users easily switch to another. As long as 1 decentralized currency remains, it's not so important for others to be decentrailzed too.
LMFAO!!! , you're killing me with that one.
It matters if you don't want all of the Fiat you invested to go up in smoke.