I think that there should be a need to insert centralized system to get the authority not coming from the government but to the cryptocurrency founder itself.
Do you think if the authority are come from cryptocurrency founder, he will not scamming investors money and run away?
Decentralized, Centralized, or Mixed (Centralized and Decentralized) still there's no system is perfect between them. Centralized and Semi centralized are similar since the authority can controlling/took away investors money/freeze your funds. But the good thing they can solve your problem if you ever made a mistake.
Decentralized are much better IMO since you're free to do with your funds and no need to worry since no one can control your money. But if you ever made a mistake, it's your own fault and no one can help you. That's why you need to learn and secure your funds first to prevent it.