Let me help you. A mining pool is not same as a miner merger. Pools are not static. It's still decentralized anonymous. The pools do not control the miners and the hashrate the miners control it and Moneros miners are independent anonymous people and not merged as a corporation with CEO like Blockstream.
Of course there is a difference between pool centralization and hardware centralization.
But although the pools don't control the hardware, they do control the hashrate. (until the miners switch to a different pool)
What you can clearly see with Monero is pool centralization, new miners apparently tend to join the largest pool.
Hardware centralization is a different problem.