More hair means more product, more lathering, and significantly more rinsing. When my hair is short, I can wash it in a few seconds. With my hair below my shoulders, it can take more time to clean than an entire shower took with short hair.

Yeah, but the GP post was talking about body hair, which kind of puzzled me.

Maybe they were (implicitly) talking about shaving their body hair? I dunno - confusing.