That is how taxonomies works by default in WordPress. There is not an archive page for “All posts that belongs to any term of a taxonomy”. And, conceptually, it is correct.
Imagine you want to list all items of a biological taxonomy system: that is listing all organisms. If you translate to posts, it is what blog and custom post types archives do.
Same applies for core taxonomies, categories and tags, if you go to example.com/category/ or example.com/tag/, you will get a “404 Not found” HTTP code status, which is correct.
If you want to have the URL example.com/products display some content, you can create a page, or a Rewrite Endpoint, and make a custom query for that URL.