Does the open outcry floor trading system in any of the exchanges still exist anywhere in the world ? If yes . Why do they exist ? Why they have not updated upgraded to the new way of electronic trading?

General
1

Does the open outcry floor trading system in any of the exchanges still exist anywhere in the world ?
If yes .
Why do they exist ?
Why they have not updated upgraded to the new way of electronic trading ?

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Can check this, though most of the volumes are moved to electronic after the rise of machines few just continue them for the legacy.