Functionally, bleacher stairs are awkward at best; a stair is far from ideal as a seat back, and if there are no cushions (commonplace, in my experience) they can be exceedingly uncomfortable.

"Stairs as a Key Design Element in 15 Works of Mexican Architecture " [15 obras en México en donde las escaleras son una pieza clave en el diseño arquitectónico] 27 Sep 2020. ArchDaily. (Trans.