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For example, Bulgaria's GDP per capita is $9,272 and Luxembourg's is $114,340. Yet, there's full freedom of movement between the two countries.

While Bulgaria is part of the EU, it's not part of the Schengen zone, meaning they don't have truly "open borders".

There's full freedom of movement, so it's an open border. The Schengen zone is no border.

it’s not an “open border”. on the contrary. there are actual physical borders between schengen countries and the rest of the eu. whenever you enter/exit schengen you have to pass border control.

If your passport shows you're an EU citizen, you're allowed to enter. So it's an open border for EU citizens.

that’s not how schengen borders work. it’s not an open border. it’s an actual border. and yes, you can be banned from travelling into schengen even if you have an eu passport.

None of the 28 EU countries can be classified as poor, let alone very poor ...

I should have added, "relative to those countries".

And these undesirable places are ... ?

Ireland is not in Schengen