I’m an American and my vision, fully corrected, is right at the legal borderline to get a license without restrictions. I’ve never “failed” a vision exam at the DMV; one time the clerk even said, “good enough”. (Don’t worry, I never drive, I only keep my license up to date for serious emergencies).
A serious emergency isn't going to be helped by someone with very little driving experience. I don't follow your reasoning. If it was a serious emergency who would care if you had a license?
People think about things differently. It may be that for OP, "but I don't have a license" would cause a second thought and waste time in an emergency. They may be self aware enough to head that off.
A police officer would. The penalty for an accident might be negligent driving.
The penalty for an accident without a license is, at minimum, driving without a license. You're also not likely to be covered by insurance without one either, even if you're not at fault.
Take a person who has marginally acceptable eyesight, who never drives, put them in an emergency situation where they need to drive and you've got a recipe for much higher odds of having an accident.
Given that getting a license is an option, and it conveniently doubles as a photo ID, and there's really not a reason to not get one.
This is one of the strangest internet myths. Every single state in America will issue a photo ID which is fully equivalent to a drivers license for every purpose other than permitting you to drive.
Also, you don't need "Real ID" to fly no matter what they say. You don't even need a photo ID at all (although they'll force you to waste time if you don't have one. I found this out when I lost mine but still had to travel.)