Why is cooler air mixed with the hot gases in a gas-turbine combustion chamber?

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Title — gas-turbine engine Open-cycle constant-pressure gas-turbine engine.

In a gas-turbine engine, cooler air is mixed with the hot combustion gases to reduce the overall temperature of the gas stream to a level suitable for the turbine inlet.1

This process is essential because the temperature of the gases produced during combustion is typically too high for the turbine to withstand during continuous operation. By bypassing a portion of the compressed air around the primary burning section and mixing it with the hot gases through holes in the combustion liner, the engine maintains an exit temperature that allows the turbine to function safely and reliably.21