What is the appeal of 'system' novels, especially in genres like Fantasy and Game?

System novels, particularly in genres like Fantasy and Game, offer a unique appeal rooted in wish fulfillment and structured progression. The core concept involves a protagonist gaining access to a 'system' – often a digital interface or a supernatural entity – that provides them with skills, quests, stats, and often a path to immense power. This system acts as a visible framework for the protagonist's growth, making their journey from weakness to strength more tangible and understandable for the reader. It provides clear goals and rewards, which can be incredibly satisfying to follow. For instance, in "Reawakening: I Can Absorb Infinite Skills," the protagonist is granted the ability to absorb infinite skills, a power directly facilitated by his newfound system. Similarly, "Virtual World: Close Combat Mage" places a martial arts legend into a virtual gaming world where his skills are translated and amplified through game mechanics, effectively acting as a system that guides his progression. This structured approach to power acquisition and problem-solving can be more engaging than organic, unexplained growth. The system often introduces elements of strategy, resource management, and even narrative prompts (quests) that drive the plot forward in an exciting way. It also allows for rapid power scaling, which is a common desire in power fantasy narratives, keeping readers hooked as the protagonist overcomes increasingly difficult challenges. The 'Adult' tag in some of these novels, like "Marvel login system" and "Reawakening: I Can Absorb Infinite Skills," suggests that the system mechanics might be used in more mature or complex ways, potentially involving darker themes or more intricate power systems beyond simple leveling up.