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Because of the simple way of expressing the things? I am not a native English speaker. ;-)

Your way of expressing the things is Nice.
Pics in your post looks like chopped from a Old Text book.

I think the new charts you see today are mostly more confusing. Perhaps more effort was made in the past. In my opinion, anyway.

Oh! what's your native language? or where are you from?

My mothertongue is german. I'm from Berlin.

Oh! I'm happy to know