Most people can understand "bigger number better". They don't need the full theoretical derivation of the watt as a unit of power for that.
And just through exposure over time they'd learn "my phone usually charges around X" and be able to see if their new cable is actually charging faster or not.
Speaking of time and timestamps, which I would've thought were straightforward, I get irked to see them dumbed-down to "ago" values e.g. an IM sent "10 minutes ago" or worse "a day ago." Like what time of day, a day ago?