Then perhaps it's a separate issue.

Well, I am not having a specific problem. Sitemap creation is a core feature of many other webapps. Useful for page rank and search engine search results, most advice on seo and stuff say. Now, when you know better then me, which could very likely be the case, and sitemaps are obsolete, if search engines work as well with/without sitemap, then by all means, save your time and don't implement it.

Thanks a lot for your detailed answer!