I'm old enough to remember the dome foam paper cups. They disintegrated in your hand and spilled naturallythe worst part about seats is that with the bench you can get your dome dog and Ginger ale and set it next to you on the empty bench. Not so easy with seats and the less flat surface.
Also you could hide your drink below the bench when people walk by, now the seats will flip up and people will kick the drinks over..
I wonder if they make a portable spring loaded cup holder device?