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Is it possibly because the font should be monospaced and the reader might then mistake the distance before and after the "I" for a space?

Similarly, in siekoo[1] the “I” is also not a straight line.

Perhaps predictable character width (monospace) makes reading easier.

I don’t get that either. Visually I should be sideways H. Z should be mirror of S.

Notice all characters use full 3px width

As in GP's proposal.

Some punctuation characters don't.