Reasons:
1. Incorrect Material: Fishing lines are usually made of nylon or fluorocarbon, materials not designed to withstand the tension and vibration of guitar strings. Nylon fishing line is too stretchy and lacks the necessary rigidity, while fluorocarbon is stiff and prone to breakage.
2. Different Properties: Guitar strings are specifically designed with properties like elasticity, tensile strength, and timbre in mind. Fishing lines are manufactured for different purposes, such as strength and flexibility in water, not for musical applications.
3. Sound Quality: Fishing line does not produce the desired resonance, sustain, and tonal qualities that guitar strings provide. The sound produced from fishing line strings would be unsatisfactory for musical purposes.
4. Damage to Instrument: Using fishing line on a guitar may cause damage to the instrument. The incorrect tension and properties of fishing line can put stress on the guitar's bridge, neck, and tuning pegs, leading to issues like warping or breakage.
5. Safety Hazard: Fishing line, especially when snapped, can pose a safety hazard. It can break suddenly and cause injury to the player or those nearby.
6. Lack of Consistency: Fishing line lacks the uniformity and precision in thickness that is essential for guitar strings. Inconsistent string diameters can affect intonation and overall playability.
Using designated guitar strings ensures optimal performance, sound quality, and safety.