DPoS have other tradeoffs. It can't be as secured as PoW networks. It can and will be a way faster (more tps) but also way less secure. Why? Becouse if you have let's say 100 "miners" (Elected Witnesses) at time, then all others are waiting for next "elections". So if i understand it only 100 miners are being paid at a time, all other have to wait and have hope to be elected. So how long can you run a powerfull "computer" while not getting paid for running it? If you can run your machine for some period of time, means it isn't that powerfull.
In my opinion DPoF is most centralized of all blockchain technologies and can't be used where decentralization and security are top priority like in bitcoin for example.
Your understanding of decentralization is heavily flawed. There are less than 10 mining pools that run full nodes and the miners don't even have to process the blockchain. Proof of Work became Delegated Proof of Work.
DPOS is the most decentralized in terms of UNIQUE BLOCK PRODUCERS PER CONFIRMATION WINDOW. It is also the only chain that has incentives aligned properly.