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1."nofollow" is there as those pages are redirecting to affiliate landing pages. As I understand it is a fairly common tactic used for affiliate links.

2. Yes, they do. Still, they have issue outranking the articles mentioning product for the keyword of product.

The pre-last sentence is probably the answer I was looking for - that "nofollow" attribute may influence sub-folders.
Still, would appreciate if perhaps somebody would have hands-on experience with this?

The thing is that the /product/review have links, actually lot of internal links and also external ones as well, so they are normally crawled, except sometimes there are some issues with them, besides often other article pages are outranking the recensione pages.
There is some issue when it comes to /review pages particularly and really this "no follow" of that folder would suit as an explanation at the moment.

I work with an affiliate site which has quite messy link structure.
The issue is that their affiliate links are www.example.com/product, which are redirected to the affiliates landing page and which are internally "no followed"

The review pages are www.example.com/product/review

The site is one of authority sites in their market; still, there is ranking issues with review pages, even sometimes with crawling.

I have been very bothered by this and my new theory is that it is because this folder /product is nofollowed, it also affects /product/review

Changing it would be insane amount of work and I would have to be sure that it is really the cause of issues, so I would really appreciate your thoughts/experience on this issue.
Thanks!