[randallsquared]

Maybe they're much better now, but 15 years ago, I used a machine that washed and dried in the same drum, and it was pretty bad at both. A full cycle for one load on minimum settings took an hour and a half or two hours, and the load was tiny in comparison to any other washer or dryer I've ever used. Even if it had taken slightly less time than separate units, and even if the load size had been realistic, I would have had to use two of them to get the usual throughput I'm used to, where I can do a week of laundry in about 5 hours (two people's clothes, bath and kitchen, bedding). If I had to use that machine currently, it would be running for a few hours every day.