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As if the people who write unreadable and nigh impossible to understand addresses would care to use such a system.

These are not “doctor’s handwriting” issues.

I would estimate that the Venn diagram of people who would use such a system, and people hand-addressing postal mail, is two separate circles.

Oh definitely, if you are willing to make it readable you would write it in all caps or even use a printer. It's either separate circles or a Venn diagram with the center containing only dozens of people.

There are plenty of details online of what makes an address easily readable. Just look at the specifications for getting bulk sender discounts.