Kraken Rewards vs Staking

Some time ago Kraken sent out emails announcing their Rewards program. They linked a page explaining it (click). If I understood correctly it does the same as their flexible staking with the difference that:

  • all eligible assets will take part
  • there are additional assets that didn’t have flexible staking (e.g., ETH)
  • you can still instantly sell or margin the assets (but I don’t know if margined assets or assets in limit orders still earn rewards)
  • there are account maximums per asset

Did I miss anything? Are there good arguments against enabling Kraken Rewards? Do they overweight the benefits?