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The most common thing we see with Shopify is that the categories are often a mess due to lack of planning and understanding. They call them collections, and it's the equivalent to doing tag/category cleanup on a WordPress site to help clear out low-value content. Another common complaint is that the blog forces you into a bit of annoying URL structure (ie. /blog/news but works well if the content is solid.

S_Curtis is correct Your actually lucky, my "not provided" is closer to 90%