Ok I have read up on the different points and in a Google search is there any real reason for a barbers notch and Spanish/Irish points?
watch out for those square points! They will hurt your eyes, as well as your face.
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+1Personal preference, mostly.
A razor has an important function to perform even before it first touches a face. It has to attract a buyer. It is useless effort to create it, if it doesn't catch the eye of a customer.
I'm sorry, but I like unmuted spikes. The corner dug in minutely maybe the first time I was shaving with a straight, but beyond that, I've never had anything close to the line-scratches shown above. With an open-comb SE, yes, but that's another story... Lead with the heel for starters. An unmuted square-point is just the greatest for sideburns (which I've had since eighteen, not going to change there).
+1It's all in how it's honed.
A muted Square, or even extreme Spanish Inquisition point will be mild as can be.
Basically - I just like the way they look.
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A roundpoint can also develop a sharp point at the intersection of the rounded tip and the cutting edge, so a roundpoint is no garuantee of safety.