There are several reasons why one might choose to use a short sword:

1. Maneuverability: Short swords are generally lighter and more compact than longer swords. This makes them highly maneuverable in close-quarters combat or confined spaces where larger weapons may be cumbersome. Short swords allow for quick and agile movements, making them suitable for swift strikes, parries, and defensive maneuvers.
2. Versatility: Short swords are versatile weapons that can be effective in a variety of combat situations. They can be used for thrusting, slashing, and cutting techniques. Their shorter length allows for quicker recovery and transition between attacks, making them adaptable for both offense and defense.
3. Concealment and Discretion: The compact size of a short sword makes it easier to conceal and carry discreetly, making it a potential weapon of choice for situations that require stealth or surprise. Historically, short swords like the Roman gladius or the Japanese tanto were commonly used by soldiers and warriors for close combat encounters.
4. Backup Weapon: Short swords can serve as backup weapons when carrying a longer sword or primary weapon is not feasible or necessary. They can be a reliable and effective secondary weapon for situations where the use of a larger weapon may not be practical.
5. Training and Martial Arts: Short swords are often utilized in martial arts and training practices. They offer a means to develop close-quarters combat skills, footwork, and techniques. Training with a short sword can help improve hand-eye coordination, timing, and precision in swordsmanship.

It's important to note that the choice of weapon, including a short sword, depends on individual preferences, combat style, historical context, and the specific needs of the situation. Different cultures and time periods have their own variations of short swords, each with their own advantages and applications.