Pixel 8 and 8 Pro already have thick graphite heat sinks to disbure heat and it works very well. My Pixel 8 Pro has not gotten even warm since the initial setup process.
The Apple A17 Pro in the iPhone 15 Pro throttles very quickly to avoid overheating. A modder has now upgraded the iPhone 15 Pro with vapor-chamber cooling to demonstrate how much faster Apple's flagship could be if the cooling can keep up with the SoC.