Haha, okay good point, what I proposed is pretty much an overly complex ladder isn’t it. In my defence, unlike a ladder it would allow you to stand straight up and - as the other comment mentioned - use your arms for other things.
I thought the same as the comment you are replying to, because having your hands free is quite a big deal. I practice parkour, and have zero problems with ladders from a mobility perspective, but they are not practical because you can't carry things up and down easily. Also, what if someone else comes for a visit? They better be ready to climb!
You can bring things up with a backpack. But yeah, it's less convenient than stairs, it looks worse and it is less inviting. That's why people like stairs. I'm not sure if the advertised product is that much better, though. It seems extremely slow and clunky.
