It’s purely a marketing ploy. Safety razors are ancient technology and there was no way to “innovate” the market when the handle + razor blade tech was essentially set in stone. Razor companies convinced consumers that more blades are better because they contact more surface area and thus allegedly reduce razor burn (not true!) and the companies kept increasing blade counts as their market shares stagnated and they needed an excuse to increase prices. Ironically more blades means the blades are all very close together and jam very easily with hair. Net, safety razors are much better, cheaper, and completely safe.
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