It is NORMAL for LOTS of electrical of all types to melt under normal use now and way more than one brand. What happens when you put plastic right next to high power requirements in normal use. The switches used to be steel bodied there and now plastic to save weight. Blower motors are some of the biggest power hogs there are. Why no fuses blew. My last 3 Fords all melted blower switches with zero wrong other than the switches are crap quality. New switch and back to like new. If the blower had shorted it would NOT be working right.
DON'T buy a Ford if you don't like that, they will smother you with melted electrical of every type you can possibly name.