It's something though, and the rest of the world is following the US in many ways. As electric dryers increase with the population and development in places like Asia and Africa, the numbers will increase.
Socially, improving commuting infrastructure so people waste less gas would easily have a larger benefit and you are not going to fight nearly as hard.
Etc etc, this might be top 50 but it's not a top 10 and it's hard.
People waste so much energy without thinking about it and for reasons that aren't particularly more convenient, like using disposable dishware instead of just rinsing off your plate when you're done. I look around at my peers even here in Mexico and see a shift, like asking for no straw when ordering a michelada.
So focusing on the specific energy usage of dryers begins to sound near-sighted. Nobody suggested that dryers alone cause all waste.
PS: For manufactured products cost is often a reasonable first approximation of environmental impact. When you get 300 paper plates for 2 cents each they really can't take many resources to manufacture. Further, by ending up in a landfill they actually act as a carbon sink.
Washing a few dishes by hand just takes a moment.
https://en.wikipedia.org/wiki/Hygiene_hypothesis
https://www.theguardian.com/society/2015/feb/23/children-all...
https://www.webmd.com/allergies/news/20150223/could-a-dishwa...