I am unfortunately don´t agree completley your opinion.

Decentralization makes control a bit more difficult. And manipulation is also not excluded.

How, for example, do you name it, if I a majority overrule what the community has set before.

Nothing else has happened.
What is the decision of the developers that the bitcoin core client accept no longer nodes?
Ok most miners and Trezor und Ledger did a kind of manipulation if you want to name it like that.

The etherium fork was also caused by a manipulation when I call so.