Why horse (four legged) robot: solid, water, air and anything in between

It's been in my mind for a while. I know horse robot is good, I've always known, but I didn't know why? This was after I submitted the research proposal of horse robot to Australian research board.

We have cars and we can go anywhere, disregarding how troublesome it is to set up the environment for cars.
The reason for horse robot is it's legendary and amazingly adequate set up for a moving transport. Four legs can do much much more compared to four wheeled car. The set up for four legged unit, is so efficient when standing up and also the variations for movements is limitless if regarding also the strength variations, for example, for a particular horse.

you would wonder, why horse robot? why not helicopter? or underwater boat? because only the realm of solid and air can give you the best freedom of movements.

i don't actually like the word freedom very much because it relates to numerous kinds of act of sin with that freedom. but in this case, only with strong grip to the ground and with the least resistance of the air, you can have the greatest movement freedom compared to any other realms.

for example, bird in the air, or helicopter for that matter, do not have strong grip anywhere. they are simply in the air, which is empty space and if they want to move, they must blow hard enough for any movement to happen. they cannot immediately rest when they are high above, or they cannot propel strong enough at any particular time.

you probably will see that also under water, under ground or any other conditions such as ground and water, water and air. these do not have as much freedom as ground and air, i.e. horse robot. this may conclude horse robot's environment. 

This makes this robot be able to be used in any planets in the universe, together with the four wheeled car.