[anc84]

And how would you find out if that question has been answered before? That would only work if there was single unified centralised question site. And then we are pretty much back at Google's single search field.

[Kaiyou]

You don't need to. It's not a problem to ask and answer the same question repeatedly. School never had a problem with that.

[candu]

School also never had navigability of past questions / answers as its explicit objective.

[Kaiyou]

Neither would the replacement for search engines.