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How come the wires that
are currently in the wiring pipe up to the switch cannot just be
extended horizontally from point A to point B where the new switch
would be? Then, he would just cap the old hole with a cover and cut
out a single square for the new switch.

To extend the wires you'd have to make a splice inside of a wiring box. In
your case, it would then be covered over with the drywall and hidden.

It is against the code to make a splice inside of a wall or any location
that is not readily accessible. No hidden joins inside of a wall or
ceiling. There will not be enough wire to just pull it over to the new
location.