Honestly I feel my skills atrophying if I rely on AI too much, and many people I interact with are much weaker still (trying to vibe code without ever learning). To take your analogy further, having a single speed bike lets you go further faster and doesn't have a big impact on your "skills" (physical in this case), but deferring all transport to cars, and then to an electric scooter so you never have to walk definitely will cause your endurance / physical ability to walk to disappear. We are creatures that require constant use of and exercise of our capabilities or the system crumbles. Especially for high-skill activities (language, piano, video games, programming), proficiency can wane extremely quickly without constant practice.