Re:Ask HN: Does SEO still work in 2018?
by treycopeland on Wednesday April 18, 2018 @11:15AM
(#16868042)
Which in my opinion, those user engaged clicks signal to Google that the link is relevant to that user for that query, especially if they stay and interact on the site. I believe that gives that site a ranking boost for that query. Those are just my opinions and cannot 100% confirm.
For site maps, it helps Google find updated content if you have a large site. It's not required, but it won't hurt if you submit one.