Nobody said they are. But when the vast majority of an entire building boom are window-wall clad towers, there is a clear issue.
Building scientists and architects know the dangers of window-wall towers. But building codes are relatively lax, and developers get away with it time and time again. We don't build window-wall towers because they are the superior design choice. It's done because it's cheap, easy, and what consumers have come to expect. Everyone has been conditioned to purchase and tolerate a high level of window-wall construction. But it's going to have to change.
I'd be lying if I said that I don't enjoy many aspects of "glass" towers. There are some benefits that a high degree of glazing brings to a project, and visually, it can be very stunning. But I'm not going to defend something on a large, broad scale, when I know how reckless and irresponsible it is. If it weren't for strong lobbyists holding back the environmental standards that we hold development to in this country, things would be very different.
Go take a look through the architectural journals and blogs of the current moment, around the world. Window-wall towers are not the cutting-edge. In fact, the majority of the most respected multi-residential projects around the world in 2014 do not resemble the Toronto approach at all. Picasso is a step in the right direction in 2014.