Ill try to answer all of this somehow.
After the PS part you said the "silver bracing". That has nothing to do with the window washing boom and is what is holding the glass up above to tower to create the crown. Its literally metal bracing to hold up the glass above the tower to create the crown. The bracing is visible because of the angle of the glass allowing you to see past it and towards the inside of the glass on the other side.
Nobody is forgetting the massive window washing boom. They can retract, as they do on most new skyscrapers you see built in the last 15 years give or take. If you don't see one of the roof of a new building, its because they hid it to keep the roof clean.
In some of the renders which I don't feel like digging forever to find, they rendered a roof into this tower, with a cut out for the boom to come in and out of. The boom would raise up or down in the same position each time, going through the slot, then it would be free to spin in any direction it needed to to reach all of the windows. Then when it was not in use it would get back into position and lower back down into the crown. They had rendered this before, and many other towers that are built in recent times do this, so that is why people keep asking. People aren't just oblivious to the massive boom on top of the building, they are asking because it had been rendered to have a roof, and most buildings do, and it was not built. Don't assume people on here are oblivious to things, because especially on this forum, people have an exact reason why they may ask a certain question or have a certain complaint.
It would have been nice to have gotten a roof, but they still could have either painted the bracing black, or covered it. It does look bad from southern parts of the city. I still think this tower is a huge success, its just that on this specific part they kind of dropped the ball. We can live with it though as this is a wonderful addition to the skyline.
