well my question is if the priority tag in Google XML Sitemaps still has any value? Is it necessary to add or can we Omit?
<url>
<loc>http://misitio.com/</loc>
<lastmod>2018-04-29T21:50:05+00:00</lastmod>
<!--<changefreq>monthly</changefreq>-->
<priority>1.00</priority>
</url>
Does my Client's second website have an updated XML sitemap with all pages with a priority tag of 100%? Well my question is if I change the priority of some of the pages to 80% or 60%. Would it hurt those pages Ranking or any visit?
One last question, this label can be omitted, or it is necessary to use it, on the site the urls are fixed, there are no new urls, so that an analysis is carried out by the search engines every month.
<!--<changefreq>monthly</changefreq>-->