Provided that it the 10% + 1% are hard-coded then it remains decentralized.
Debatable definition of decentralized.
Secondly. In regards to 10x1MB not being equivalent to 1x10MB.... the reason for this is not because of the protocol itself, but because of the extra energy required to set up these identities. It may not initially seem like much difference but the difference is still there. My analogy may have been a bit off in terms of what I wanted to portray, but you are taking a cut to your maximum processing power when you start dividing up your system. As Vlad has pointed out, 89% is a hefty chunk.
I'm assuming by "energy required to set up these identities" you're referring to some proof-of-work system (and not a manually verify your government ID to Vlad system). How is it imaginably possible that managing two identities' proof-of-works on a computer would be harder than managing one identity on a half as capable computer? (Or multiple identity proof-of-works over a botnet, with one identity per bot.) The idea is pure fantasy.
If there is abuse it simply won't matter anyway. The idea isn't equality or that you are rewarded for the exact amount of work that you put in, but that you took part in the first place and attempted to mine. It is true that some will be able to boost their income, but they are not going to be able to get all of that 10%. Lots and lots of others will get a share of that too. The point is, that everyone is rewarded for their contributions not just the big miners who get a huge stonking reward anyway especially later on in the difficulty.
So now you're backtracking on the idea that the VGB protocol is secure, and admitting it's just fantasy. If you remove the VGB fantasy from the picture, what you have is a "currency for the miners" which gives only 89% of the currency to the miners.
It won't matter if someone releases a coin that gives 100% of the benefit to the miners, as Vlad pointed out, there are many coins which only give 30% to the miners yet have still got onto the small exchanges without issue. It's up to each miner whether they want to mine it or not. Should it be brought out, I'd be happy to mine it and I hope that a lot of other small miners will also be encouraged.
What sort of screwed clonecoin gives only 30% of the block rewards to the miners? And how does comparing against that make this one any better? (Suggested advertising line: "Nazi gold was obtained from killing jews; at least MagicCoin doesn't do that! Please use MagicCoin, it's not that bad!")