Discussion
Why does a driver stage often have its own small heatsink?
Answer: A
A driver passing a hundred milliamps with twenty volts across it dissipates a couple of watts, which is more than a small package can shed unaided. Temperature tracking is the bias spreader's job, the drivers dissipate far less than the output devices, and their temperature limits are ordinary. A stage that looks small-signal on a schematic can still need cooling, and checking the current-voltage product of every device is what catches it. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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