In regards to the reason the majority of people with HE impeller style washers are unhappy with them, just watch this video. Skip towards the middle if you want to get to the "action". This is with a decent sized load of clothes, and yet there is barely any water to be seen, and the clothes are hardly moving, much less wet. I have heard of these washers working well, but 9/10 of those people that have said that also stated that it worked well with only small loads, where the clothes can move and flex. I take most reviews with a grain of salt; Consumer Reports is a regulated joke, and I quickly dismiss anything that uses simple phrases like "Great washer" or "I love it", but you can tell when a review is sincere because they actually go into a bit of detail about what they like, along with what they dislike, and when you read the detailed reviews from people that are unhappy with their product, they all align with the same sentence "The clothes barely move, and some are even still dry". What's more, you can find many videos of these washers, all with the same results.
The point is, you simply can't get good results with the amount of water these machines use, regardless of how it operates. There's just not enough for it to flow through the clothes and suspend the dirt and soap. The lack of hot, or even decently warm water furthers the problem, because no matter what the "engineers" or DOE think, oils and most dirt can't liquefy and break loose without heat.
I think it will get to a point where health concerns will emerge, and most likely it will be from long term effects of what's being put in our detergents. We're taking away all the natural resources that are needed to perform well, and replacing them with strong chemicals to do the job that common sense physics does perfectly already. I don't know why money is not being invested more into finding ways to recycle our water more efficiently, only to be told that we just need to use less (I wouldn't be surprised if one day we're told to adjust our bodies to need less water as well), and why it's okay for chemicals to replace what heat does naturally, but like some of the other points stated earlier, that's for a different forum.