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A lot of e-commerce solutions don't really give you much scope (out of the box) to add a great deal of text content to the product category pages but I can assure you, it's well worth the effort to do so as that copy can make all the difference to your rankings. A fair percentage of your traffic is likely to arrive from top/mid-funnel searches such as 'dining room chairs', for example, and having a paragraph of text, which gives a quick overview of the product range, gives you an opportunity to include the keyword in copy AND  provide further information about the products and service you offer in relation to this product, should they require it. After all, we can skim/skip the copy if it's present and start viewing the products themselves, but give people the choice. Personally, I'd want to show at least some introductory copy on a category page as I've seen the benefits it can deliver (and the detriment of not having any present on the page). If you are able to deliver your potential customers directly to a page which shows off a representative cross-section of products which match their search then you stand a chance of converting them into actual customers. Yes, you could have a separate landing page for 'living room chairs' and then provide a link to the product category but that's effort and gives the visitor another opportunity to go elsewhere. Show them what they want as quickly as possible and the best way I've found to do that (when dealing with product categories similar to this) is with additional copy around the product content.