Thanks for the statistics, but it might be a bit too soon to draw conclusions on the subject. Maybe median payout is higher only because there's less posts... (Activity is divided by 2 if same amount of people decided to stay on either one of the two blockchains, whereas the stake has stayed the same - with the airdrop, except for Stinc's stake, but as they never voted on posts, it doesn't impact the distribution of rewards).

So saying the objective of decentralization has been fulfilled on that basis might be a bit premature.

For me, it's about governance, not distribution of rewards. Some of the witnesses are large stakeholders, are the ones funded by the HPS, are the ones writing the code, deciding on forking or not, etc... Distribution of rewards means nothing, distribution of stake is much more relevant in the matter of (de)centralization.