It's odd because when iOS development was new the docs and HIG were very comprehensive. Almost every answer regarding iOS on places like StackOverflow would be "here's a link to that part of the docs". They also had a lot of good examples.
And now they’re gradually making those old docs unreachable. I don’t know what Apple’s endgame is here, but it’s pretty sad.
Those of us that are old dogs can still find most of them on the archive, because we know kind of what to search for, but even those might disapeer one day.