You are missing the central point of the Walkie-Talkie and Disney-Concert-Hall controversies. These are Frank-Gehry(-style) buildings, and in those roughly half of all surfaces is a concave and half is a convex mirror. THIS concentration to one point is what turns the summer sun into death rays.
Reflected sun, by definition, has a little less energy than direct sun. So, given the mirror walls are straight, as the designs show, you get (at maximum) 200% of normal desert sun energy, which isn't comfortable, but not a Gehry-style death ray.
Reflected sun, by definition, has a little less energy than direct sun. So, given the mirror walls are straight, as the designs show, you get (at maximum) 200% of normal desert sun energy, which isn't comfortable, but not a Gehry-style death ray.