On Sitemap utility
A sitemaps helps to make sure all your pages get indexed, but that's it; it helps; it's not strictly necessary; as long a page has links the SE's can find it, if they do find it and put it in the index depends on the amount of links; so, having them in the sitemap is rather important, but not strictly necessary.
about the utilities; yes, the free ones have a limit; this one max 500 pages;
xml-sitemaps.com
you could do it section by section or ... pay for it ...
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