Earlier quoted context omitted.
To qualify for 'Energy Star' in the US, you have to use 10% less energy/resources (water) as last year. No standard; no other goal. Result: clothes washers that don't wash (my washer at least has a button to override Energy Star, obliquely named Extra Rinse or Heavy Duty), dishwashers that don't get dishes clean; water heaters that deliver luke-warm water. The goal cannot have been "Use less energy, even if it means…
You larger point may hold, but I'm pretty sure Energy Star has fixed standards. It's not simply that your product most do better than its 2011 version.
So it is likely to change over time.