When using the the trigger Order in WooCommerce there is no data field containing the product category. This is severely limiting for segmentation as SKUs and product IDs don't always flawlessly indicate the category.
For numerous email marketing clients I've wanted to segment them based on the product categories in WooCommerce, Zapier provides every bit of information except this.
Edit: I've been testing with webhooks, Legacy API, etc as well but so far no luck. The product category is nowhere to be found.