There are several reasons why it is recommended to use guitar maintenance agents:

Protecting the surface of the guitar: Guitar maintenance agents can help protect the surface of the guitar from fingerprints, dirt, and scratches. This helps to keep the appearance of the guitar clean and novel.
Extended lifespan: Regular use of maintenance agents can extend the lifespan of guitars. For example, fingerboard oil can prevent fingerboards from drying and cracking, while polishing agents can prevent damage to wooden surfaces.
Improving sound quality: Maintenance agents can improve the sound quality of guitars. For example, keeping the strings clean and using string maintenance agents can extend the lifespan of the strings and improve their sound quality.

Improving performance: Guitar maintenance agents can enhance the performance of guitars. Maintaining the lubrication and cleanliness of guitar tuners can ensure their normal operation, thereby improving tone stability and playing experience.
Preventive issues: Regular use of maintenance agents can prevent common problems with guitars, such as cracked fingerboards, oxidation of strings, and odor from speakers.
Overall, using guitar maintenance agents is an effective way to protect and maintain the guitar, ensuring that it remains in good condition for a long time and improving its sound quality and performance.