Popular photo editing software continually adds features, which can increase the power it requires to run smoothly. As a result, faster processors and more RAM are necessary to run big programs. Lightroom requires a minimum of 8GB of RAM to run but recommends 16GB of RAM for the best performance. These requirements will likely increase at some point, and while you may not need 32GB of RAM right now to edit photos, you may need it in the future. If you plan to edit a large volume of RAW files, having more RAM will make a big difference to how quickly you can process, edit, and export photos. For people who make a living shooting weddings, upgrading to more RAM will make a big difference.