So the NEC requires GFCI on a dryer that DRYS clothes where its likely used in a normal environment with a fully clothed and dry person, BUT...... If you sit naked sweaty wet in a sauna next to a metal appliance with the same voltage and power as a DRYER..... that's OK, no GFCI needed there. They leave that up to the manufacture. Although would it might be considered to be under (indoor damp or wet locations) 210.8(A)(11)
I am not advocating it I am just venting.