Maybe one of the reasons is how MANY americans (specially millennials) to laundry.
Sorting clothes:
Sort the clothes in two piles - What can go to the washer, what won't fit in the washer.
Don't worry about colors, dirt level, lint "donators" or lint "receivers". Tide Pod should deal with everything.
Toss everything in the washer. Whites, light colors, blacks, that underwear with tiremarks, kitchen towels, mopheads, pet blanket, the dog, the cat, the hamster, the ferret, the door mat, etc. If something goes wrong, no problem, you can write a review saying how terrible that washer or that detergent is.
Then select normal cycle or "quick wash" or simply hit power and start, because it's 2017, who cares about selecting a cycle anyway? They should work or we can simply return the washer, sue the manufacturer, without forgetting the horrible reviews.
Then the clothes go to the dryer (if i don't forget the load in the washer for 3 days). toss everything, that's how dryers work. this is USA, our dryers are huge the clothes should dry.
Then there's the wrinkling. after writing a review about how horrible the dryer is and about the clothes that didn't dry, i can use Febreeze wrinkle releaser. if it doesn't work, i can write a review saying how horrible that product is.
In other words... no matter how hard you try to design a good dryer, modern consumers will always complain. so why spend time and money making them reversible?
Also, as they are huge and people mix sheets with small items, the tangling/rolling problem is somewhat naturally minimized.
Because of the F-word millennials I've made a washer with only ONE cycle (and of course i personally hated it). I have a folder with over 300 emails from customers asking me to make a washer that wasn't complicated to use, because selecting a cycle is not "user-friendly". Now i have tons of emails from people that saw the product features and loved to know they can just hit power and start buttons.