Huh?
Bitcoin is the most decentralized out of all coins...
Mining pools don't equal miners. Mining is also free market. Of course it slowly condense but miners don't control it. All system have to condense att one point but in Bitcoin mining condensation doesn't hurt it.
Bitcoin mining is just one part of the control system. Users/holders,Devs,LN nodes,Buiness are all other parties that keep bitcoin in check. And how in the world is bitcoin dev centralized? Anyone can join. The only reason why "few" people code is the same reason as any other system. Not everyone can code. And no Blockstream doesn't control Bitcoin either.