I would expect windows in tower blocks to have very limited opening, for reasons of safety. Then again, I wouldn't have expected them to have window frames that could melt in a fire.
It could also be because the hinges are then on the inside and burglars cannot remove the door by driving out the hinge pins. I have outward opening French doors and they need dog bolts to protect against that.
But not impossible, assuming you want them. Mine are at the back of the house and I don't bother with either.