If you are building a World War II scene, downloading random weapon packs from ten different creators will result in a jarring visual experience. One gun might look hyper-realistic, while another looks like a cartoon prop. A themed GMod addons pack ensures that all assets share a similar art style and visual fidelity, making your screenshots and gameplay immersive.
Many advanced packs (especially for Wiremod or ACF) are hosted on GitHub. You download the master branch and extract it to garrysmod/addons/ . gmod addons pack