Fancy dryers dry faster only because the fancy washer is spinning the clothes faster at the end of the cycle. The technology inside clothes dryers hasn't changed in 30 years, even in the fanciest models. Look up the parts, they still use all the parts and design from models 30 years ago. It's actually comical. Source: I repair dryers.

They haven't found a better way to convert electricity into heat, or a faster way to use a flame to dry the clothes. Even old dryers had moisture sensors to turn the machine off once it sensed the clothes were dry.