Fresnel magnifying glassfor reading

there are plastic lenses and fresnel lenses (like a ribbon of thin plastic instead of a thick magnifier) that I think could be rugged and not shatter like glass

I'm new to this topic so pardon me if it's a stupid question. but recently I watched a well-known youtuber give a great demo about starting fires in survival conditions using multiple methods. Then I saw someone post their fire kit here, and both times it never included a magnifying glass.

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Ray tracing works by using mathematical equations to simulate the behavior of light rays as they pass through different materials and surfaces. This allows us to predict how light will be bent, reflected, or absorbed, and how it will appear to the observer.

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One of the main limitations of ray tracing is that it is a time-consuming process, as it involves tracing the path of each individual light ray. This can make it difficult to simulate complex optical systems or real-world scenarios. Additionally, ray tracing does not take into account certain phenomena such as diffraction and scattering, which can affect the behavior of light in some situations.

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Circular lenses are often used in ray tracing to control and manipulate the path of light rays. By bending the light in specific ways, circular lenses can create a variety of optical effects, such as magnification, focus, and distortion.

Ray tracing is a method used in optics to understand how light behaves when it interacts with different surfaces and materials. It involves tracing the path of a light ray from its source to the observer, taking into account the properties of the materials it encounters and how it is affected by them.

Ray tracing has many practical applications in optics, including designing and optimizing optical instruments such as telescopes, microscopes, and cameras. It is also used in fields such as computer graphics, where it is used to create realistic visual effects in movies and video games.

Is there some obvious reason I'm not aware of that these aren't part of every fire kit? Again, sorry in advance if it's a stupid question.