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No. Modern environments don't just reduce how much we move. They also remove movement from everyday activities.
With short steps, your weight clearly over your standing foot and the whole sole down at once. Grip doesn't just come from the sole of your shoe. It also comes from how you step. When your eyes are on the ground and your pace suits the conditions, your body has time to adapt.
An exact temperature rating can't be given, and there's a reason for it. A boot doesn't produce warmth. Your body does. How warm your feet stay depends above all on whether your toes and feet get to move. When you move, your feet warm up.
Yes. A winter boot doesn't need to be thick-soled and sturdy. When your foot gets to move, it warms itself, and a good winter boot keeps that warmth in.
