This consideration is just about
PR distribution IMO
ask yourself if you stripped away header and footer links on your site, what would the internal linking look like? would you be passing enough equity
and relevant anchors to the top pages you want to rank?
Ideally, you want to stick one rich anchored internal link to any page X from any page Y where it makes sense to logically do so (kind of like wikipedia does)
I believe I read some nugget somewhere which said "not all links are equal.. sidebar or nav links are not equivalent to editorial links". I am sure one can do some searching and find some info in this regard from one of the googlers
fwiw you can import suitable data and visualize your internal linking in gephi, with and without nav links.
https://www.advancedwebranking.com/b...e-using-gephi/