The best reason to have it broken up is for posterity to be able to annotate the changes. If there is a 100 line refactor followed by the 10 line actual functio

The best reason to have it broken up is for posterity to be able to annotate the changes. If there is a 100 line refactor followed by the 10 line actual functional change, then it's a blessing to be able to look at that in isolation when something has gone wrong with it 5 or 10 years later.