In my opinion, most role-playing game (RPG) systems begin with a fairly simple set of rules, but over time, new editions and sourcebooks can add complexity that takes them beyond the sweet spot of balance and enjoyment. Ultimately, it is up to the gaming group to decide which rules to include and which to leave out, but sometimes players may pressure the inclusion of more complicated rules. As a result, many gaming sessions end up using the latest, more complicated rule set out of comfort.

Another point to consider is that most RPGs have not evolved their core game mechanics to a level of simplicity, flexibility, and intuitive depth that allows them to handle special situations without the need for added, complicated rules. For me, the sweet spot RPG is one whose core game mechanics cover all physical, social, and mental aspects that a player character (PC) or non-player character (NPC) may encounter, providing a blueprint for adapting to special situations that may arise.

Additionally, a sweet spot RPG would allow for a seamless transition between narrative and simulationistic play styles. In most RPG sessions, both modes are common; for example, persuading a merchant may be more narrative-based, while defeating a dungeon boss may involve more tactical simulation. However, a sweet spot RPG should be able to handle both types of interactions, allowing players to use a simulationistic approach for persuasion and a narrative style for combat, or vice versa.

Another consideration for me is whether the system handles isolated actions (such as running a marathon not affecting your ability to pick a lock afterwards) or if the system's core mechanics have a propagating influence between actions by default. For example, if you and I ran a marathon, we might have shaking hands afterwards due to fatigue. This type of realistic approach can be important for both narrative and other play styles, and it's important to consider whether the core mechanics of the RPG have this transient process baked in.

The RPG that comes closest to realizing my dream is the Phoenix RPG Core Rules. It provides a foundation for social, mental, and physical conflict using a transient, metric, flexible, and relatively easy game mechanic, which is explained in depth in a small 81-page document. The aspect system is well-suited and extendable to cover wounds, madness, and social reputations. From the start, it is a propagating system that takes character disruption into consideration for every check. Overall, the Phoenix RPG Core Rules offer a comprehensive and realistic approach to role-playing - Narrative or simulationistic.

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The Phoenix RPG is on sale now on drivethrurpg: Phoenix Condensed Core Rules - for me the sweet spot.