Where's the actual line between using AI to code and not learning to code anymore?

A developer is contemplating the evolving role of AI in coding, questioning the traditional advice to "practice writing code yourself." They acknowledge AI's speed in generating working code but express concern about potentially losing the ability to reason about code if they rely too much on AI. The developer is curious about how others in the field balance AI usage with maintaining their coding skills, and whether manual coding still holds value for learning or if it's merely nostalgia.