You're talking about SP, I'm talking about VESTS
The ratios do not change significantly over a short time period (only about 5% divergence per week) and not at all if you measure both rewards and power down using the same units.
3 power downs, 1 week of no power downs, and only curation. It's pretty much even.
Come on, that's completely silly! He voluntarily reduced his powering down rate to match his reward rate. Every single user who ever earns a reward at whatever rate whatsoever can do that!
It is also seriously cherry-picked BTW. Depending on which particular time period you choose on that chart you can get the result to increase, decrease, or stay the same!
I think the most important point you are missing is that rewards denominated in VESTS decrease single every day. Everyone here now, including @wang, is an "early miner" in a sense and we are all benefiting from the rewards being much larger than they will be in the future. That short-term fact shouldn't be used as a basis for system design.