For example, a person may only want to power down half their stake. Therefore, the 10% fee should be based on the amount desired to be powered down and not the full amount staked.
I guess it was understood that the fee only implies to the amount being powered down. Not to the full hive power. Thanks for you feedback. :)
I mentioned it because from what I gathered from conversations people seem focused on full power downs. In reality, people are likely to only want to sell part of their stake rather than all of it. An instant power down function should accommodate that.