Without considering a website’s homepage, category pages on e-commerce sites generate most of your organic traffic - are any of you surprised by this statement? If this comes as a shock, I have bad news: you might need to reconsider your information architecture. If you have done your job right then you have nothing to worry about.
Curious about how much organic traffic category pages actually account for, I decided to dig into the Google Search Console of a client of Distilled which has been a very successful e-commerce site for several years. These were my findings over the past 6 months (at the time of writing, November 2018).
Bear in mind this is just an example that shows a fictitious URL structure for an average e-commerce site - the level of category and subcategory pages often differs between sites.