Earlier quoted context omitted.
You are right that for able bodied people it's at best a gimmick. But it might be useful for people with limited mobility, who don't want to depend on other people washing them.
Gimmick? Maybe, I’d love to try something like this.It may not save time, but i bet it feels glorious.
Hence it's a gimmick.
Though I bet it would get old really fast.