Single window fire-escape

Amsterdam & 141st.

I wonder if it meets fire code? And if so, why there aren't more?

Or must the fire escape provide access to 2 different windows, or 2 different rooms?

And why don't they make fire escapes more useful, and provide a larger balcony area (like in theaters, just make sure to keep the aisle clear)

What are the rules/ laws?

Something about prewar buildings, 6 stories in height or shorter.

And for tall buildings, just more stairways??

(This was seen on a Go Bus to Boston, leaving from 31st & 8th, headed up 9th then Amsterdam, until heading east at 155th)