In order to determine which blockchain is the correct blockchain, Proof of Stake blockchain users need to trust that they have been told the correct account balances.
And along the same lines, seems to me like POW-POS hybrids are only as strong/decentralized as their Proof of Work component.
Do you agree?
Hybrids do not combine the strengths of the algorithms, they combine the weakness.
Most hybrid coins eventually drop the wasteful PoW as it only leaves a 51% attack vector.
PoW is a dead end due to their ever increasing input costs.
PoS is the Future for any coins wanting to survive.
FYI:
Vitalik would not know a True Proof of Stake Design even if it bit him on the ass.And I'm saying you have this backward, Proof of Stake has an inherent single party attack vector, Proof of Work only has a 51% attack vector, which is much stronger.
Still, neither are as strong as Frink's upcoming Proof of Person

no i don't think it is "inherently" centralized but it can become centralized a lot easier than PoW because it is a lot easier for a whale to buy a large portion of a specific coin (to have a large stake in it) and control the coin that way and then get out in a very fast way if he chooses to. but you can't get out of PoW because you need to sell equipment which is not as easy as dumping coins!
The other problem is they can dump their coins, then go back in time and start mining from a block previous to when they dumped their coins and good luck proving which fork is legitimate.