Sitemaps are still useful. Eg. my previous employer ran a very large site with hundreds of millions of possible pages to crawl. You can use the sitemaps to help

Sitemaps are still useful. Eg. my previous employer ran a very large site with hundreds of millions of possible pages to crawl. You can use the sitemaps to help the crawler prioritise given limited crawl budget. Disclosure: work for Google nowadays but have zero insight into anything internal that's search related. The above is just common sense and should apply to most search engines.