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The length comparison does not even worth it because as I mention if somebody delete one line and add another line automatically that length comparison fails which make it just a waste of time and code...
Comparing Items with the values still not the best approach... I could have a line which have a linked record on that line(any kind) WOs, POs, Custom linking... if somebody remove the line and add the same item back with the same quantity still fails...

<@U8UAXP75H> <@U373C5U11> Actually my previous statement was wrong a quick length comparison and returning false on a function to check if the array are equal could save a lot of time and unnecessary processing if you know from the beginning that they are different.
The bad news is there is not unique line key on new lines on `beforeSubmit` event so values comparison is needed where you need to also include line number otherwise if you have duplicate items it will also fail...