Opportunity for autonomous reiteration. Games that amount to primarily spreadsheet simulation alone are less impacted by variance such as the factors experienced across play. Their moving parts occur primarily before the gameplay even starts, and thus do not compound or interact in potentially exponential ways. Compare a PvE raid to any popular MMO PvP mode. The latter will usually seem more self-reiterating because of the added moving parts. They may cycle back to a predictable regression, but the majority expands on itself in a way that makes it constantly, in at least some way, new.