In my project, I am aware that there are two versions of Normalize.css. Version 2 is designed for IE8+, Firefox 4+, Safari 5+, Opera, and Chrome. However, I have decided to use version 1.1.2 instead of 2.1.2 because it needs to be compatible with older browsers like IE7 and ensure cross-browser compatibility. What potential drawbacks might arise from not using version 2.1.2?