Operating temps are very important for the life expectancy of many wheel related items. Wheel bearings, bearing seals, caliper seals, brake lines, tires, brake fluid and many more related items absorb significant amounts of heat from the braking system. All of that heat is a considerable factor in how long those items last along with how long the brake pads will wear before losing friction levels and wearing out.
In both graphs, the solid lines are the maximum temp and the dotted lines are the average. The blue is the same pads in both graphs as the orange is the same in both. Driver, car, ambient temps, and lap times in both runs were very similar and provided a great basis to compare the temps.
You'll note that while the compound in the blue had a significantly lower operating temps, it transferred more heat into the brake fluid. This was due to a difference in pad material remaining, with the compound illustrated in the blue lines having significantly more wear when the tests were conducted.
You can continue analysis like this to include things like max pressure required, average pressure used, max deceleration rate, and many more items. Choosing brake pads just took on a whole new dimension!