Good day, ppl.... I was wondering if the absence of an XML sitemap will adversely affect SERPs. Specifically, if a page has already been indexed by Google, and maybe even doing well with keyword SERPs, all without the use of a sitemap, will the inclusion of a sitemap do anything to boost rankings for keywords at that point? I've always read that a sitemap is essential. But beyond letting search engines easily discover where pages are located (which they find anyway by crawling) how does this help anything?