That doesn't mean we can't be accommodating, especially on longer routes (like Lines 1/2). Even if we accept the idea that pain from plastic seating is caused by medical factors on the user's side, may I remind you that this is public transportation, meant to be used by everyone from your young and active freshman high school student, to an aging 75y/o grandpa whose legs are about to give way. Its especially important in the latter case since the people who need seats the most are often folks that have some medical conditions and don't have the energy to stand around all day.