Logically it doesn't make sense to increase the dart frequency if your journey time increases by more than 2.5 minutes.
On average, with a fifteen minute frequency and assuming you just turn up and go, you will have to wait 7.5 minutes.
On average, with a ten minute frequency and assuming you just turn up and go, you will have to wait 5 minutes.
So you gain on average 2.5 minutes, which is lost entirely if the journey time is extended by more than this.
And that excludes any other disadvantages of increased frequency like slower commuter services, frustrated drivers at level crossing barriers that are down for longer, cost of additional drivers.
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