While I agree in general with your sentiments re meddling, there's an argument for some degree of doing so and that such legislation drives innovation... look at the clean air acts and low emission zones in Europe and elsewhere and how car manufacturers have implemented lower emission, higher efficiency, small-volume turbo-diesels to meet those requirements. Would they have done so if not for 'meddling'?
They are measured at
a) idle (where they are burning least fuel, and producing about 1 percent of any waste.)
b) at a fixed "cruise" rpm. Where they are not under any load and not propelling a car.
At every other throttle position or rpm, or load, the emissions are not measured and are always far higher. Its easy to map an engine to be cuddly and polar bear friendly at the 2 points where its measured, and be grotesquely polluting at all other points on the 3D fuel/boost/ignition map where it actually gets driven. What's more most are exactly like that.
Bikes for eg, have all kinds of trickery in the fuelling, ignition etc. The old Suzuki's for eg had a pink wire connecting the ignition/fuel map to the gearbox to reduce power, emissions, and noise on an EEC drive past test at WOT in 3rd Gear. As soon as any mechanic or owner gets hold of it they disconnect this so it runs properly... The car industry do all the same tricks.
Vaccum cleaners are a bit different. They are sold to the ignorant public like drills are. The more "watts" the better and more powerful it is... My 2000 watt vacuum cleaner says 150 Air watts! That makes it just 7.5 percent efficient!