I have just installed a bathroom vanity that came with screws and anchors. However, I just screwed the screws directly into the drywall, which has 2×4 framing positioned exactly where the screws go. I did not use the anchors.
I understand it may be a good idea to do use anchors to make the screw holes more reusable in case of taking the vanity off and putting it back on for painting, for example. I was wondering if there are any other pros and cons for using anchors (e.g. code regulations). Should I take my directly screwed in screws out, widen the holes with a drill, set the anchors in and reinstall? I thought vanities and other forms of heavy load that gets hung come with screws with anchors because of the option to install into masonry, where you are more likely to do need anchors.