I am still amazed that people don't use the performance of a flying-machine to climb above inclement weather. It seems so logical to use the 3 rd dimension to avoid interaction with Terra Firma.
(no, I'm not a pilot, but have some experience of light aircraft
CS, as you earn the privilege to fly, and gain experience, the many possible and probable reasons for not flying over weather, in most GA aircraft, will become apparent, and your amazement will recede.
Many of us here have flirted with flight out of VMC when we should not. Now we actively encourage other pilots not to go there, until properly trained, and flying a suitable aircraft. The key to GA safety is NOT using the 3rd dimension when weather gets poor, return from whence you came on the 2nd dimension you came on! If you are flying the valleys, there is no GA aircraft with the performance to safely climb out within the valleys, to safe airspace above - If the flight is not planned to be flown in IMC from the beginning, changing to flight out of sight of the ground along the way is probably very unsafe.
Some GA type destinations cannot be reached at all with a flight planned in instrument conditions.