@ramon, the reason is definitely not UX-related… It’s all about how do you really measure the amount to power in your house that is “Always On”. A couple of prerequisites:
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It has to be a 24 or even better 48 hour measure measure to catch the quietest times in your house. The quietist time are the times you are likely to see the remaining Always On level. Therefore, Always On is related to the lowest measurements over a 24-48 hour period.
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But you don’t want the Always On number to drop wildly for 48 hours, just because Sense dropped a couple measurements, or you flipped-off some breakers for a couple of minutes, so it can’t just be a rolling minimum for the past 48 hours. So Sense included a stickiness factor by using the 1% bin minimum over the past 48 hours. That means Sense uses the biggest of the smallest 1% of the readings over the the last 48 hours.
Some people don’t like that measure, but having seen it evolve through a few iterations, this is the best algorithm I have seen yet to get at a value you can’t measure directly.