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We recently changed our wordpress site and I have noticed that in the new theme all the internal links are set to nofollow. I understand that Google might not decide page rankings based on internal links but isn't it good practice to do a follow on internal links to highlight the relative importance of a page

I noticed when doing link analysis that for some competitors the backlink from slideshare is recorded with a 'no-follow' beside the link. Other sites analyzed don't show a backlink from slideshare despite having this link in their slideshare pages. Is the no-follow resulting in the backlink getting recorded to improve domain authority but not SEO authority?