Parent Page / Child Page or no?
I know WP has an option to make Parent/Child pages, so URLs will look like this:
AND you can manage sub-pages via Appearance >> Menu. (Setting up top-level navigation and sub-level or drop-down navigation, along with various menus like main, footer, etc., etc., etc....)
So my question is... is it necessary to do both (create the parent/child pages along with the top-level/sub-level pages?) Or will a site be ok with just the top-level/sub-level navigation managed in the Appearance >> Menu panel? Does a lack of parent/child pages affect SEO? Is there a benefit to having the parent/child pages? If so, is there a special or strategic way to use the parent/child pages? Or is this simply one of those things in WP that`s not really used anymore?
Google search was a bit inconclusive, so I`d appreciate your feedback. Thank you!