yes
The strength is in the impact. Once the damage is done, the glass (of course) is damaged far more than steel.
When you look at it in this fancy, we put huge forces on something that is only 5 or 6 mm thick. Steel would bow and bend to the point that the edges would need to be reinforced with large bracing. Yes, you could weld it which you cant with glass
Im involved doing tests in with double glazed units into timber windows and at the same time they also tested single glazing. The test involves having a wind tunnel try to suck out the glass in these frames. 170 knots is called extreme and these achieved 165 knots before the frame in the window started to bow which could have resulted in the glass coming loose. The test was stopped at that point and the frame modified. Next time it will pass, there is no doupt about that. Just think, a large piece of 6mm glass that is roughly 1800mm x 1800mm with that sort of force and still it didnt break
I honestly love this trade and the research Im involved with.
Unfortunately as in all trade and professions, there are those that are only interested in getting the bucks and doing cheap shoddy workmanship. You the consumer that buys on price only is the problem that allows 2nd grade workmanship exist. we all need to see what we are getting for our dollar which is why I needed to talk to and explain the pros and cons of the dog door.
Cat doors are great but dogs are just too strong