The /blogs.atom RSS feed URL would only show the latest posts from the main blog index, not all the individual blogs or subcategories like /blogs/recipes or /blogs/academy. Each individual blog on Shopify has its own unique RSS feed.
To get an RSS feed that includes all new posts across all your blogs (such as /blogs/recipes and /blogs/academy), you’ll need to use the individual blog URLs with .atom at the end of each, like:
/blogs/recipes.atom
/blogs/academy.atom
Unfortunately, there’s no built-in way on Shopify to combine all blog posts from multiple blogs into a single RSS feed. You might need to create a custom solution that aggregates the feeds if you want them all together. Some users use third-party services or apps to combine multiple RSS feeds into one.