I've tried bouldering in a borrowed pair. Edging gets painful fast. Far too much stress on my toes. Having separated toes and a relatively pliable sole produces an awful lot of foot strain.
Real climbing shoes are tighter and more rigid. They do just the opposite of what these barefoot shoes do; they bunch your toes together, forming them into a kind of single supertoe. It's probably about as bad for you as wearing high-heels, but it's very effective.
Also, the soles on barefoot shoes are not sticky enough for climbing, so smearing doesn't work too well.
I've done rock climbing in both the five fingers and regular rock climbing shoes. Rock climbing shoes are definitely better 99% of the time, their rigidity helps you to maintain secure footholds.
There's the occasional exception though, I was once able to gain a foothold in the five fingers by sticking my big toe in a hole that fit it exactly.
Real climbing shoes are tighter and more rigid. They do just the opposite of what these barefoot shoes do; they bunch your toes together, forming them into a kind of single supertoe. It's probably about as bad for you as wearing high-heels, but it's very effective.
Also, the soles on barefoot shoes are not sticky enough for climbing, so smearing doesn't work too well.