when bitcoin was centralized, i think it is good for us to be use and legalized on some other part of the globe. we all people have a freedom to use bitcoin wherever we are and whenever we want. but there are a few worst in it if someone can takes control bitcoin in our country, one is they break the privacy of our used bitcoin wallet for easy to them to know who is the persons who hold that amount of bitcoin and some other personal information to us. they also control the value of bitcoin from its original price in the market and they implement a tax to done in every single of us.
As you said when the bitcoin was centralized we can use it on anywhere in the world .But if it was centralized the taxation will come into play.When there will be the taxes for using the bitcoin then thr bitcoin will lose its potential that it have today in the world market.so its better that it dont have to centralized.