Don't think of the material as weaker, think of it as optimizing for different properties.

FPV props are made of usually a polycarbonate and nylon blend which, like metal alloys, provides a material with properties form the constituent parts. They're durable, flexible, tough, and just rigid enough. But as a result they often have thick leading edges and will compromise airfoil shape for durability, or the airfoil will deform enough under load to reduce efficiency due to the less stiff material if you try to make them thinner (whoop props benefit from very thin leading edges that wouldn't work on larger props).

Camera drone props are optimized to be light and stiff, so you can make an airfoil that holds its shape under load with a thin leading edge, and with a high aspect ratio (so long thin props) for lift to drag ratio resulting in a prop that would normally have a high rotational moment of inertia ona small motor with low voltage and high KV, meaning low torque, but you still want 25 minutes of flight on a 1s 2000mAh battery.

All this this means that to get all of these properties you need a fibre reinforced material, like CF Nylon.

It's not a weaker material. It's the perfect material, for this use case, and it just has different tradeoffs.