CAFE is the corporate average fuel economy standard (hence the acronym) and EPA tailpipe regulations are why catalytic converters show up. You don't even recognize that they are separate things. Health is effected by air pollution. There are doomsday people but the air in LA or Chicago would look like Shanghai or Beijing if you were in charge. The smog was really bad in those places in the 70s and even I remember Chicago not being super good in the early 90s and it's actually significantly better now. So the fact that you hate this stuff doesn't really matter. It's not going back.
So which is it? They aren't rollers. You never said it has to be the same. I mean you love blanket statements and contradictions. It still needs the oil film not to scuff
Carb icing is a real thing, especially when you don't have any of the anti-icing stuff like a heat riser, exhaust crossover, heated intake tube to the air cleaner. When your transfer slots are frozen the car runs like absolute total ****, its happened to me. They teach about carb icing when they are training for a pilot's license since it's even more likely to happen in that application. Its 50F or less and over 80% humidity here A LOT.