The pictures of the blown gaskets are typical of what we see in cars suffering from a high temperature fan switches, neglected thermostats or 89 degree thermostats, and common "green" coolants. They did not fail from a single overheat episode, but from both the repeated temperature overshoots the higher rated thermostats and fan switches cause and from the deposits from the electrolytic action of common coolants and the metals in the head and block. The movement of the expansion and contraction during temperature changes and the action of the deposits and the coolant got the gaskets over a long period of time.
Keeping the engine temperature from big temperature changes, i.e. installing a matched cooler thermostat and fan switch minimizes frequent temperature changes during operation. This minimizes the movement of the head and gasket. The interface between the gasket the head and the block is not a static one. The head is made of aluminum, the block is steel. They have differing expansion and contraction rates as they heat up and cool down. The head ,in effect, "floats" on top of the block and the gasket is the one caught in the middle. With a fan switch that is hotter than the thermostat, the head actually gets much hotter than the coolant at the switch that turns the fans on. By the time the fan switch does get hot enough to turn the fans on, the radiator and fans have a lot of catching up to do. The head gets even hotter before it starts to see the cooler coolant from the radiator. This is a temperature overshoot. The best example is to watch your temperature gauge after you pull off the highway and get stuck in traffic. You'll see it go way high before the fans come on. The head and block are expanding with the heat. You're moving less coolant (low engine rpm), and flowing next to no air through the radiator (low vehicle speed). By the time the fans do come on, they are way behind and getting farther behind. When they do come on and start to cool the coolant in the radiator, the head and block then get the deluge of the cooler coolant and start to contract. During these expansion/contraction cycles, the head gasket just as well be in a grinding mill.