The real win will likely be in forcing manufacturers to make parts available for 10 years after the life of the product. Parts are currently readily available from a number of specialist suppliers for the main brands. there are also guides and videos online explaining how to troubleshoot and replace parts on the most common appliances. I've replaced heating elements and pumps over the years at very little cost.The new EU law about fixing products I dont think is going to make much difference
For things like washing machines where parts have been in good supply, I think the challenge is more societal, people got out of the habit of trying to have items repairs, taking the excuse to buy newer models instead.