but wind farm towers are popping up all over the place
And its that sort of thing that becomes a problem - chart clutter.
All wind farms, all towers over 200Ft AGL, mining and quarry outfits wanting danger areas for everywhere they blast to a few hundred feet well away from AD/ALA ....... what else? Latest I heard from a contact was a model aircraft mob somewhere wants a danger area instead of their existing chart symbol. Do that and you set a precedent.
And with respect to wind farms and towers, how do the map makers find out about all of them, and satisfy themselves that they've been provided with accurate coordinates?
No simple solution.
There is a CAR, CAAP or something that relates to hazards to navigable airspace and is fairly wide in scope. If you see something that you consider presents a hazard to aircraft, report it to the local CASA office (a pix would probably help) for them to assess.