List questions are as Shog9 describes in the Meta Stack Exchange question you linked, What is the definition of a list question?: they're the types of questions from our Don't Askquestions from our Don't Ask which lead to unbounded opinion collection in which every answer is equally correct. These are for example the "tell me your favourite X" or "what do you use for X?" questions, which are discussions or surveys, and there's no opportunity to solve a problem nor provide an "answer" as such. Other formulas of questions can experience this problem, e.g. "what are the ways to do this thing?" may or may not be close-worthy depending on whether the thing is "do magic" (bad) or "enlarge my AD&D 2e Fireball spell" (OK).
Most often these questions will specifically be too broad, which has for its close reason: "There are either too many possible answers, or good answers would be too long for this format." I'll note that "too long for this format" means about 30,000 characters (about a 16-page essay), and it doesn't mean "very long" — we do long answerswe do long answers. Opinion poll stuff is primarily opinion-based.
Lists of things in a single answer. A question that asks "I'm in this situation and need to achieve this result, how can I do that?" regularly gets a response of "here's your options, best to worst". That's good.That's good.
On topic. Let the people who want to maintain the list do so; we've demonstrably got people willing to work on crazily large lists, and we've got people willing to drop 500-rep bounties to encourage someone to get things back up to date. (See Comprehensive list of WOTC D&D 4.0 products?Comprehensive list of WOTC D&D 4.0 products?, and How do you tell if a D&D book is 3.0 or 3.5?How do you tell if a D&D book is 3.0 or 3.5? for crazily large list examples.)
Often a good question that needs a list, like "what are my options for doing X", "what spells meet {difficult to place criteria}", involves researching and compiling options for an answer. Where that research requires non-obvious resources and/or significant expertise (such as in Sets of spells that have explicit bonuses when used togetherSets of spells that have explicit bonuses when used together) I would suggest the question is non-trivial.
A question like How do you tell if a D&D book is 3.0 or 3.5?How do you tell if a D&D book is 3.0 or 3.5?, given the listy answers it wound up with, is nontrivial because it requires significant research effort I would not reasonably expect the average person to know how to do, and expertise in being able to know how to distinguish which books belong in that collection.
