Pretty much, it's also about curtailing content based on your audience. Say that people on mobile don't need to read all the reviews on the page you would hide it or show it in a different way. Whether or not to use pure is completely your personal preference. There are a gargantuan amount of responsive frameworks, you should look at what they offer to your own goals of customization or extensibility. Foundation for example offers lovely JavaScript addons you can use for modals, sliders and navigation.
Good luck and please add to your question if you need to ask more!
Your choice to use pure I feel is a good one because its extremely light weight and style agnostic. While bootstrap and foundation are more popular choices they can be up to 10 to 20 times larger.
Check out TukTuk as well, its similar in nature to Pure: http://tuktuk.tapquo.com/