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This is because people have different types of skins, and even for the same skin - depending upon time of day it could be soft or rough. Also the shaving cream/oil matters for the shave. Thats the reason why Trundle advises to try different blades. Whats good for one, might be bad for another person. IMHO most important factor which most people overlook is actually the angle of the shave. They blame it on the blade, instead of correcting their technique.

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I've always wondered why there might be a difference for blades.

Creams and brushes, sure. If you have very soft, sensitive skin and soft straight sparse hair, you won't enjoy a hard brush and you won't need as thick a lather as someone with thick curly hair, so you might prefer a softer brush (less "backbone"). And some people might have adverse reactions to lanolin or find menthol irritating rather than refreshing.

But a blade's sole job is to cut hair, for which, presumably, the only quality required is sharpness, preferably retained for as long as possible. Aside from a less sharp blade being less of a pain on someone with softer and sparser hair, I can't see how blade experience would vary from person to person. What's your (or grandparent's) view?

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