Comment by vehemenz

Right, but the LLM can help you practice the skill too. Without the LLM, you're in a self-guided, autodidactical mode. Obviously, that can have its own advantages, but most people—but especially novices—aren't in a position to assess their skill level or their progress. The average person isn't going to magically get better at thinking or writing without formal training, or at least some direction.