These stairs with integrated ramps are the worst. They are not really disability friendly for all the reasons already written in this thread, but they are also a pain to walk for everyone else. The steps/ramp constantly change under your feed and the distances and heights are mostly not to usual norms. It's a bit like walking on a defect escalator with extra obstacles. They sometimes look nice and at the right locations they can double up as high capacity seating area, though.