Disadvantages

Toughened glass is difficult to break therefore has limited break glass use. Assumingly, there are situations where you would WANT glass to break, I personally can’t think of any, but there you have it. In that situation, toughened glass would not be appropriate

Limited design – confined to simple shapes. Quite simply, complicated glass shapes are difficult to be made tough. More often than not, toughened glass is made in the form of simple shapes and sizes, such as a large square for a French window perhaps.