What is "open mode" and why is it in Vi but not in Vim?

Question

From the Vim documentation:

1. Simulated command                    *simulated-command*

This command is in Vi, but Vim only simulates it:

                                               *:o* *:op* *:open*
:[range]o[pen]          Works like |:visual|: end Ex mode.
                        {Vi: start editing in open mode}

:[range]o[pen] /pattern/    As above, additionally move the cursor to the
                            column where "pattern" matches in the cursor
                            line.

Vim does not support open mode, since it's not really useful.  For those
situations where ":open" would start open mode Vim will leave Ex mode, which
allows executing the same commands, but updates the whole screen instead of
only one line.

This does bother not mention what "open mode" is and I have became interested in it.

Is it another editing mode like -- REPLACE -- and -- VISUAL --?

Can you explain what open mode is and tell me why it is useless and got scrapped from Vim?

What is "open mode" and why is it in Vi but not in Vim?

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