I don't know why convex mirrors aren't common. There must be a well researched reason like them leading to bad judgement of relative speed or messing up with sp

I don't know why convex mirrors aren't common. There must be a well researched reason like them leading to bad judgement of relative speed or messing up with spatial awareness of the driver. Hard disagree about backup cams. I can't think of a single new or old car that would be objectively better off without a backup camera. No amount of rear glass will make you see a cat or a dog that's standing right behind the trunk.