The seat probably uses the exact same mechanism for both the seat back switch and the operate when seated switch. This type of mechanism is probably also consid

The seat probably uses the exact same mechanism for both the seat back switch and the operate when seated switch. This type of mechanism is probably also considered safer. A mechanism where you momentary push a button and then it "pulls back all the way" would probably warrant extra consideration for having something stuck in the rails or bumping into someone. I could see these two factors weighing into someone's decision to just use this design.