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If your are typing a password manually, it's helpful if the font you're using makes it very clear when the character is 0 vs O, or l vs I vs 1

What I was asking is why would you design a font that makes it easy to confuse iIl|1O0, etc... we need to get rid of those fonts.

Oh, yep, I misread your question as asking about the need for "unambiguous" fonts.