I agree on not deleting the wiki content as a whole, but a good trimming is in order. Certain pages are little more than an uncut conversation between anonymous participants, in addition to being obsolete.
What is needed is for somebody to step up and write really amazing, brilliant docs. At which point, then the section can point to them.
and who will judge whether submissions clear this bar? I think 2021 haskell.org should incorporate the best content out there (after a voting process!), make it the official learning material, rather than being a link dump.