The centralization is required due to poor design and because Sunny King likes centralization.
That's an opinion. You failed to provide a rational answer which can be falsified.
The difficulty adjustment happens so fast it can't make it out to the solo miners who aren't using long polling.
What technical aspect are you talking about?
Sunny King has gotten the people that posted about these problems to remove them from the forum. Sunny King wants to cover up the truth about PPCoin.
If you see posts disappeared, start quoting them. This at least leaves traces behind. Use those as references.
Bitcoin doesn't have this problem because it waits two weeks to calculate difficulty. PPCoin only waits 10 minutes to calculate difficulty so you should expect large swings. Bad design.
Why do you think "large swings" are a bad design. They are a response to the changing hashing power. I find it rather great the the difficulty adjusts quickly - keeps the block rate more constant.
The large oscillations, or ringing, are also a product of the way the difficulty is calculated. It's unavoidable for this coin.
It's not a function of the coin or the difficulty adjustment, it's rather a function of the strength of the network. Large entity miners can play with the minting rate adjustment. It's unavoidable. The only solution to it is to avoid large entity miners.
Actually it is entirely because of the design. See this link.
http://en.wikipedia.org/wiki/Ringing_artifactsAre you proposing to use an envelope function for the running average? In which way would this improve things? Please be technical, which oscillations to you consider harmful?
Hooray for the pioneers in the RealSolid navy! They never get to go on shore leave because the boat just keeps driving in circles.
If it weren't for pioneers we'd never have boats on the sea.