You may think of it as one key for all energy boxes (a broken valve or a hole in a gas tank) vs multiple keys for every energy box (oxygen molecules). To burn a liter gasoline you have to mix it with the ~same amount of oxygen. It never explodes all at once except in that rare situation. An empty tank is exactly that, because gasoline is volatile.

Energy boxes that can be opened with a single key are more dangerous, cause more prone to accidents. Pressure, kinetic storages, self-sufficient explosives are all much more dangerous than stable chemical bonds.

Also, gravitational potential can be accumulated in a single-key way too. That’s why cliffs are dangerous, but staircases are less so, because energy release is dosed with each step and flight. You have to actively err on stairs to take fatal damage.