Street boneless, backside, frontside, they do serve a purpose. They get you comfortable jumping on your board, if you can blast a big frontside boneless it feels pretty good, if you get anywhere close to Jeff Phillips on a vErT ramp or Lee Ralph then more power to you.
But, maybe we should ask Kelly Hart with his jump rope expertise, the front to back to front to back hopscotch jump rope boneless is no joke.