Ask your questions on discourse.nixos.org please - the documentation situation in Nix-land is generally exactly as you have noted, which means centralised question-asking in well-known locations is much much more helpful for Those Who Come After.
Agree. I feel the same way about OCaml, and I have forced myself to ask every questions I have on SO to build the list of answers there. Yet, people tend to answer on SO with “you should ask on the OCaml discourse”…