Do all in one units just not work very well? Putting the heat pump dryer inside the washing machine sure beats using the whole bathroom in terms of efficiency,

Do all in one units just not work very well? Putting the heat pump dryer inside the washing machine sure beats using the whole bathroom in terms of efficiency, both electric and effort. I feel as though America’s “dryer culture“ is based on General Electric and others simply wanting to sell you two appliances instead of one.