And my MacBook is on macOS Monterey 12.2 (21D49)

I posted details as another answer below. What is feedback ID?

Yes, depending on conditions outside of our control, heat behavior will change. This is even true of our own developers - we cannot control room temperature very well, especially given recent heatwaves and WFH! This makes measuring heat-based metrics very challenging. Thus, I'm hoping to use battery drain rate as a proxy metric.