Ethereum is only centralized if you dont run your own node. It is as practical to do that as it is a bitcoin node (but not for what the person you replied to was trying to do). This is an absurd distinction, and even if it wasnt absurd or wasnt practical then it is a fixable issue. Because it already has been fixed. Geth has a pruned fast sync client that has everything necessary for consensus, it takes about the amount of space and resources as a bitcoin one.