I think you are correct that a network using DPOS is able to process many more tx/s than POW and POS. But I think DPOS isn't much diffenent than the current system where the processing power behind the applications is limited a few big companies. Now what about the billions of smartphones around the world? Because most of them aren't able to store an entire blockchain their capabilities remain completely unused. I guess this is where IOTA comes in and tries to provide the ability to make transactions from every device. The main problem with IOTA is that, while it could make even more transactions than DPOS possible (probably, this still has to be tested), currently it doesn't plan on supporting smart contracts because it doesn't use a blockchain but a Tangle (Directed Acyclic Graph) (looks pretty efficient, but there are some safety concerns). Can you see where I am coming from? My main concern is that DPOS makes it close to impossible for me to contribute to the network directly (processing power/ storage space) even if I wanted to. Maybe this problem simply can't be solved using just one cryptocurrency and has to be extended using systems like Golem/Swarm. Thanks for reading :D
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DPOS is much more centralized than PoW or PoS in my opinion.
At first the voted in producers may not know each other, but over time they will get to know each other and even start working with each other (just like miners in PoW). Once all the most influential block producers learn about each other, they can start forming deals that benefit themselves at the expense of the normal network users. Then run misinformation campaigns to make sure they stay voted in, or even change the voting rules to keep themselves in.
It's a system that's highly efficient on the technical side, but relies quite a bit on trust. If major corruption goes on at least we can (theoretically) fork the system and start over with new producers. Not sure right now if EOS will allow forks like that but I think it needs to in order to keep the block producers honest longterm.