Double-edged swords can be practical in certain contexts, depending on the specific purpose and combat style. Here are a few points to consider regarding their practicality:

1. Offensive Versatility: Double-edged swords provide versatility in offensive capabilities. With a blade on both sides, they allow for a wider range of attacking techniques, including thrusts, cuts, and slashes from various angles. This versatility can be advantageous in certain combat scenarios, providing options for different types of attacks and engaging multiple opponents.
2. Balanced Weight Distribution: Double-edged swords often have a balanced weight distribution along the length of the blade. This balance can contribute to better handling and maneuverability, allowing for precise control and quick transitions between offensive and defensive techniques.
3. Defensive Capabilities: Double-edged swords can offer effective defensive capabilities. With a blade on both sides, they can be used for parrying, blocking, and deflecting an opponent's attacks from various angles. The dual edges can provide options for defensive maneuvers and counterattacks.
4. Historical Use: Double-edged swords have been utilized by various cultures and warriors throughout history. For example, the European longsword, the Chinese jian, and the Roman gladius are all double-edged swords that have proven their effectiveness in their respective historical contexts.
5. Training and Skill: Effective use of a double-edged sword requires proper training and skill. Wielders must develop proficiency in techniques specific to double-edged swords, such as maintaining edge alignment, executing precise thrusts, and transitioning between attacks smoothly. With proper training and experience, a skilled practitioner can make effective use of a double-edged sword.

It's important to consider that the practicality of a sword depends on the specific combat style, the skill of the wielder, and the context in which it is used. Different sword types, including single-edged and double-edged swords, have their own advantages and limitations. The choice of a sword should be based on factors such as the intended use, the user's training and preferences, and the specific requirements of the situation.