I know you know all these points by heart, and you're good at delivering them. But DPOS is not the panacea you think it is. If it were, every currency would move to it.
1. Regarding resilience, how do you guard against a DDOS attack on the 101 delegates?
2. Regarding decentralization, how do you prevent a Sybil attack of delegates?
3. Regarding incentives, long term, how do keep your voters interested in nominating the delegates?
Ans. 1. You can't 2. You can't 3. You won't
1. Actually, people don't have to know who is running your delegate. It just has to broadcast the signed messages through the network, but you can never know which node is actually running a delegate. At least that's how it works in BitShares, not sure if they did it the same in LISK.
2. I'm not happy about fixed 101 people running a large network, which is what I didn't like in BitShares. However, having each side chain run its own 101 delegates (at least as I understand it - that's the model), means that utility will be spread out to more delegates and not just the ones running the main network. I wish they figured out a way to run more delegates, 101 is just too low. Or at least cycle through a larger group. So I agree with you that this here could become a problem in the future.
3. The only way I can think of that would work is by having a lot of stats and reports and an easy way to auto-check and vote out the underperformers. If the checks and balances process is not automated, people won't care to vote. It was the case in BitShares as well.