The EU rules may have not directly stopped hot fill, but the energy rating labels have resulted in problems complying when having hot fill.
The same with fridge/freezer, the EU did not stop the manufacturer of fridge/freezers where the freezer was larger than the fridge, but the way the energy ratings worked resulted in the smaller the freezer is the easier it is to comply, so finding one better than 50/50 is rare now.
With freezers the use of energy meters does help, the manufacturer says what annual use should be, OK variables due to how well loaded and how often door opened, but if they say 365 kWh/annum you can test if 1 kWh per day, and if 1.5 kWh you can assume some thing is wrong.
I did it with mothers freezer, it used 60 watt when running, and in 24 hours used 1440 watt/hours, it clearly was not switching off, so alerted me to fact there was a fault, could be loss of refrigerant or going too cold, it turned out faulty thermostat and was too cold, which explained why she was complaining ready meals were not hot enough. The idea was meals were taken from fridge/freezer and the freezer on top was back up supply, so should not have being using ready meals direct from freezer, but she would ask carers to heat the meals and they would some times take them out of top freezer not the fridge/freezer.
So there are some things where measuring the energy uses helps, even if to just make one aware of cost, for example for a TV or TV box to record programs with correct time even if program delayed of brought forward the EPG needs to be active and in turn if using satellite the LNB must be powered, so the unit uses maybe 10 watt on stand-by. But if using pure time and no correction if programs times moved, the power used can't be measured with a plug in energy meter.
Not sure if still true as Sky Q uses internet, so may not keep LNB active any more, but old Sky+ used around 10 watt on stand-by to keep LNB powered. So much for 1 watt limit.
