Why was the traditional running stitch used in hand sewing considered a limitation for mass garment production?

Answer

It produced a relatively weak seam that could unravel if the thread broke

The hand-sewn running stitch is formed by a single thread passing over and under the material repeatedly. Because of this method, if the thread snaps at any point, the entire seam loses its integrity and can easily unravel. This inherent weakness made hand stitching inefficient and unsuitable for clothing that needed to withstand the rigors of daily wear and industrial factory work.

Why was the traditional running stitch used in hand sewing considered a limitation for mass garment production?
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