Interesting thought....
I think it's the bouncing around in the dryer that makes them soft though not just the heated forced air?
I don't use one, we hang everything out to dry and in bad weather indoors on a rack.
Might be because I'm used to it, or maybe associate it with line dried clean smelling things, but I kind of like that fresh laundry 'crunchiness'
It does go away pretty quickly with use.
...hanging them out in the wind will do the trick also.
Seems like just folding the bath towels takes away some crunchy?
I do find that using soap nuts make the load of laundry softer in general?
I remember my brother coming home from college after discovering dryers...from then on he couldn't stand to wear jeans or use a towel that had not been softened in that way.....