I bought HS Ashe and Frejlord right before it went Legacy and I got the other 2 from friends via mystery gifts. I honestly learned Ashe supp for HS Ashe as justification for buying the skin and then I learned Ashe ADC later on. When I play normals with some of my high elo friends I always duo bot with my support main friend and he actually goes Ashe adc and lets me Supp him.
Ashe has always been good though. She doesn't have as good of a steroid as most ADCs but with her passive + shiv she can easily 3 shot any enemy and she is a good team player which works really well in a meta of carry tops and carry junglers.