Let's imagine that you are converting some OO code back to traditional non-OO style, is there a need or will you merge two or more methods into one function? No, that is absolutely not required.

You wouldn't merge function, but remember that many objects are just containers for a bunch of variables. They are nothing more that structs, and many objects are full of small accessor functions of the form:

sub accessor {
    my $self = shift;
    $self -> {key} = shift if @_;
    $self -> {key}
}
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That's code that will evaporate when converting OO to non-OO, as you would replace the call:

    $obj -> accessor ("value");
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    $obj -> {key} = "value";
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And by eliminating many short methods, the average size of the methods will increase.

Abigail