'One can find oneself in many different situations so a variety of methods of defence is necessary, again, for the reason that some methods do not always allow one to adapt to a situation with ease.
If you were to be engaged in an argument in a crowd, or caught between two rows of armchairs, chairs, or tables, you cannot apply a fair number of the kicks from French boxing.
There are also a number of cane blows which require a fair amount of space to throw. (Thrusts require much less).

One may have been seized, by surprise or otherwise, while finding oneself in darkness.
It also happens that one is jostled by others or hampered by the narrowness of the place where one is attacked: a corridor, stairwell, etc.
Sometimes the ground is less than favourable for widening your stance.
Very different situations need to be considered.
In summary, one must study many combat sports in order to combine their use,
as needed, but also to use one-or-other of them by itself, depending on circumstance.'
Emile André