But I never claimed differently.  Mining pools will act in the advantage of miners, but them being not very numerous, can form easier a cartel.  You could see mining pools as the "worker unions" of miners: there are a number of worker union delegates that can form a worker union cartel, and hence push modifications in the advantage of themselves and their members ; something the individual members wouldn't be able to do because they are, exactly, too numerous, too decentralized.  Mining pools are the way miners have found to break decentralization and get the power of modifying the rules on their side.  However, as long as  one can maintain dissent between mining pools, effective decentralization is still working, and keeps the old protocol immutable / or imposes still the will of the central code monopolist.