Although that question is basic -- it is conceivable to me that many professionals might not know this. They might be trying to administer a unix box for the first time and are just confused by not having any numbers in there. I can see someone new typing man crontab, not knowing that the man pages have sections, see no asterisks and giving up. Therefore I make the personal decision not to move it.
The question also isn't terrible since the person bothered to use punctuation, the shift key, code tags etc...
The idea is that questions that are relevant to system administration and have a straight forward answer to someone will likely be useful to others in the future even if they are basic. It hopefully will only ever be asked once and it becomes the canonical answer.
The famous question on stackoverflow relating to this for programmers is Joel's "How do I move the turtle in Logo?" and it is talked about in this stackoverflow meta post. In podcast 58, if I remember correctly, Joel is more for basic fundamental questions being okay to be asked once than Jeff was.
Ultimately the decision must be made by the community itself. Now that I am a moderator, I only cast a vote to move a question if I am very confidant that everyone will agree (hopefully get that right -- yell at me in meta if I don't). It takes five close votes to move the question and this is how the community can direct where the line is drawn. This system also makes the community flexible over time. As the question base grows more questions should get closed as duplicates. However, I think discussion of this on meta is a great idea as well.
Sorry if I missed your point a little with this one. I went and edited the top answer in the question you referenced. Here is how I look at citing manual pages in particular:
Worst thing to do -- Server Fault Aims to stop this:
RTFM YOU IDIOT!
Better:
Insert Direct Answer Here.
This can be found in man blah
Best I can come up with:
A description of how to use the manual page system in *nix so they will be better equipped to professional solve problems. This is how I addressed your particular sample question.
Am I still missing your point?:
I still feel I might be missing your bigger point about pandering and/or spoon feeding. If you or anyone else has a chance to get some links to questions on this topic it might help define the concern a little bit more. I think I see your concern about the site not satisfying more professional and advanced users and that it certainly something we can use our new meta site to try figure out.