More Precise Pedal Assist
There are a number of advantages to using torque sensors on electric bikes, including:
More Precise Pedal Assist: Torque sensors measure the amount of force applied to the pedal, making pedal assist more precise and tailored to the rider's needs.
Greater energy efficiency: By adjusting the pedal assistance according to the amount of force applied, greater energy efficiency in the use of the battery can be achieved, which can increase the range of the electric bike.
More natural riding experience: The pedal assist provided by a torque sensor is smoother and more natural than that provided by other systems, providing a more enjoyable and comfortable riding experience.
Reduced Drivetrain Wear: Precise torque measurement at the pedals can help reduce wear on the bike's drivetrain as the pedal assist system more efficiently adjusts to the rider's needs.
Increased safety: By adjusting the pedal assistance according to the amount of force applied, it can ensure that the electric bike is safer and easier to handle, especially in situations such as steep climbs or uneven terrain.
https://www.aventon.com/blogs/aventon_bikes/torque-sensor-vs-cadence-sensor-on-electric-bikes
In the link above you will find some interesting information as well.