If one manufacturer makes the majority of the asic miners what will prevent them from building in a backdoor to remotely control all there miners? Therefore hijacking the network and forcing concensus as they will.
I believe Bitmain had that in their miners but they claim not to have used it. But there is always the "nuclear option" that Luke Dashjr and Cobra will be happy about.
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Bitcoin core is a small group of developers that dictate the future functions.
No group of developers, big or small, can dictate. Do you know what drama and how long it took just for Segwit to activate? Do your research.
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Both these makes my worried that bitcoin is not decentralized at all but it is merely an illusion.
Do not worry. Bitcoin is decentralized because there is no single point of failure.
