Unfortunately cache sidechannels defeat a lot of measures that would otherwise destroy timing data. I agree that there can be some cases where it doesn't matte

Unfortunately cache sidechannels defeat a lot of measures that would otherwise destroy timing data. I agree that there can be some cases where it doesn't matter but it's extremely expensive to be sure that it doesn't matter-- making it usually cheaper, when you consider the total costs, to deploy code that doesn't have the sidechannels.