Could you give some examples of "bad things"?
The only changes we could make to the coin would be software updates and adding new features to the protocol (like shipping information, for example), not change the ledger or individual balances. Just like any business, if we change the product and customers don't like it, that hurts us much more than it hurts the customer. I edited the original post a bit to clarify this. By "non-decentralized" we mean that there are tiers in the network, not that the entire coin runs on our server.
Not being able to change the core encryption method of a coin like Ethereum or Bitcoin without a hard fork is a massive limitation, we want to overcome that.