This model defines the great coalition as a politics with no extremes thus little left wing, right wing or green politics.
A great coalition does little thus does not address the major challenges. Even right wing politics would do more (at one point and only addressing a symptom but not its cause).
An interesting variance btw is to connect well being of society with great coalition arguing that as long as most people feel well they want little change. The analysis of such an arguments shows that green politics short term still is best but long term (next screenshot) great coalition becomes positive and green politics negative. The effect stems from the dynamics once even little green or left wing politics takes effect people are satisfied and do not need more. As if Angela Merkel new this with her tiny steps towards more environmental protection and social security.