“a lifesaver” when applying WooCommerce

Rolling back your files only, as a strategy for backing out of a WooCommerce upgrade, is not sensible. You are relying upon any problems in the upgrade being related to code in files only, and not to your database. The article does note that your database isn't being rolled back, but I think the above line is unfortunate because it may encourage people to think that perhaps that doesn't matter very much. Before applying WooCommerce updates, use a backup plugin.