Quartz should have ended mechanical watchmaking. It was more accurate, cheaper to produce, and needed no winding. By any measure that mattered to an engineer, the argument was over by 1975.
What survived did so for a different reason. A mechanical movement is a few hundred components converting a coiled spring into motion measured in fractions of a second — and someone decided the parts you would never see should be beautiful anyway. Bridges are bevelled on their hidden edges. Screw heads are polished black. Wheels are circular-grained on faces that face nothing.
None of it improves timekeeping. All of it is why the craft is still here.