Yes, I do not believe it is decentralized. Bitcoin's anarchist days are long gone.
I used to believe that Bitcoin was the gold of the modern age. That is to say, gold is seen today as a means of storing wealth, not as a means of shopping together with the invention of money; Both by people and by central banks.
In modern times, I thought that bitcoin, a digital value based on hash power, could be seen as a means of storing wealth.

But,
A thought: the gold is a certain element in the periodic table. Throughout the ages, people have tried to make gold with alchemy, though technology has not progressed so far. The only way to get gold is mining.

Bitcoin is not. As a result, it continues to be developed by a software and core team. So after they come out, they can say that bitcoin is changed from now on. Hard fork, soft fork, segwit 1,2,3,4,5 can do everything. The bitcoin in your hand can also be split into 10 forks. Contrary to gold, they can give bitcoin any shape as they wish. Powerful states and corporations, rich people, deep powers, who can control and manipulate the world by affecting the world as if they are asking the developers of the bitch.

Bitcoin core is not in one place, but I seem to hear you say it is scattered. After all, who is more likely to have the power of mining and bitcoin if he can not afford it?

Is Bitcoin a decentralized system? On the contrary, it is necessary to think about what will evolve as a central system in which your wealth is governed.