It used to be enough that a Pokemon Gym had a walkway with a couple trainers before your final challenge. Maybe a pool for the water gym, some switches for the electric gym. If you included a teleport puzzle it was a big deal.
Those tricks don't fly in Kalos. You go big or you go home. Every gym has to have a huge gimmick and related puzzle before you can challenge the gym leader. Every. Single. Gym.