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Thin movements may be more vulnerable to damage from impacts or even normal wear and tear, as some components are sacrificed for the sake of thinness
Lower torque:
The thinner the movement, the less room there is for the mainspring to generate power, which can lead to a reduced power reserve.
Winding weight leverage:
The diameter of the winding weight is smaller in slim movements, which can reduce the efficiency of the winding mechanism.
Inaccurate timekeeping:
Extremely thin movements may be less accurate due to the challenges in precisely aligning and adjusting components