First off: this is something that y'all need to work out among yourselves. There's an ongoing discussion regarding the nature of that question here: Como podemos lidar com as "listas"? and the question itself should probably be locked until that concludes. The folks participating in that discussion - Gabe, bfavaretto, bigown, Bacco, Sergio and others have all raised some valid points, but reading through the (machine-translated) discussion thus far I'm not seeing a clear solution. So to address your point: there's no clear documentation for why it should be closed/reopened because that discussion is still in progress.
Beyond that... I think you're asking why this question would become a focal point for such discussion in the first place. I've been working with Gabe on structuring this discussion, and I'd prefer it stayed on PT.SO, but since you brought it up here I'll try to explain some of the background...
Individual Stack Exchange sites vs. network standards
PT.SO is not Stack Overflow. There's a decent amount of overlap between the membership on both sites right now, but I don't expect this to be true for very long. Because of this, it isn't enough to just transplant the standards and practices currently in effect on Stack Overflow:
If the community doesn't establish their own standards and buy into ours, they won't enforce any of them. As Robert notes, we provide plenty of guidance, but each community must make it their own - and during that process, each site develops a bit of local flavor. Some sites are extremely strict as to form and topic, others are considerably more flexible. And that's ok...
Learning from history is a big part of building a new Stack Exchange community. But this must follow the form of learning from past problems and implementing solutions that work for each individual site: folks who fail to keep this in mind and try to shut down problematic practices with a blunt, "this violates Stack Exchange rules" find themselves perpetually embroiled in heated and unproductive discussions.
Monkeys and ladders and programmers
There's an old story about monkeys and a ladder that's supposed to demonstrate how rules can be passed on long past the point where anyone remembers why they were put into place...
...Turns out, it's probably bunk. Monkeys don't work that way. And neither do programmers. If there's a tasty banana or useful topic to be had, a few old primates yelling about dire consequences are going to be ignored. You have to be able to explain why something is a bad idea - and if at all possible, offer an alternative solution.
Ideally, this can be accomplished without having to make the same mistakes and repeat the same bitter arguments on every new site. But the only way that'll happen is by conducting informed discussions focused on specific problems - sweeping them under the rug doesn't work.
...Which brings us to the topic at hand. Let's face it: that question sucks right now. You don't need years of history on Stack Exchange to tell you that it's not a particularly good reference. But... It does reflect a real need. There's a reason lists of books were popular on Stack Overflow for years and still feature prominently in several wikis (either tag wikis or Community Wiki questions): new programmers who are conscientious enough to actually want to do some self-study desperately want a short list of expertly-chosen books that'll help them do so. And it shouldn't surprise anyone that the Portuguese community is under-served in this regard as well... Bigown attests to this frustration:
Aside note: Every programming book in portuguese is bad. Every site about programming in portuguesse is bad. SOpt should be the oasis for us.
If the demand for these references was so great on Stack Overflow (where the English-speaking audience has a wealth of existing book lists, Amazon reviews, etc.) that it took us years to be rid of it, imagine how hungry the audience on PT.SO will be! This strikes me as a very real need, and one that will be very difficult to just ignore.
So then, what can be done? If this format for questions is known to work poorly but the audience is clamoring for them anyway, how do we resolve this tension?
Well, that's the point of the discussion that Gabe raised the other day: to get folks involved in finding a way of serving those with a need without hurting the site. I'll note that this is hardly the first time a Stack Exchange site has faced this question: communities as diverse as RaspberryPi and English Language Learners have both found themselves faced with a large, inexperienced audience in desperate need of learning resources, and have found ways to step up to the challenge.
It's not an easy problem to solve, but I have faith that the good folks on PT.SO are up to the challenge.