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Why does a ECU need a relay to activate?

Practical Motorsport Wiring - Club Level

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just a beginner here but cant you just connect the ECU to the battery directly to power it, what is the point of using a relay for the ECU and how exactly would the pins of the relay be wired

Wiring of the relay is shown in the power design module.

I think it has to do with the order of the enable power sequence, to be able to have the ECU to start first and its relay to trigger a second relay that will activate the actuators as shown in Zac's diagram below that course module. But hopefully someone more experienced will be able to confirm.

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