If I ask anyone what accessibility means to them, usually the first thing that they can identify is 'Adding alt text!' All you have to do is add alt tags to your images makes your site way more accessible, right? I love the enthusiasm to reduce accessibility errors, but I am about to give you an infuriating response. It depends.
Adding alt text may mean that you don't get pesky errors about missing alternative text on an Accessibility Scan, but it doesn't necessarily mean that your images have a better meaning. Sometimes an empty alt tag is actually what you need for a more accessible image. Are you envisioning the mind blown emoji and/or gif yet? (via @yayMark)