One of the interesting things about this thread, for me, has been the distinctions that [MENTION=16586]Campbell[/MENTION] has been drawing between "scene framing" approaches and "MCing/principled GMing" approaches.
To me, at least, that's new - I don't recall seeing it in any of the other threads you referred to.
Another interesting thing has been the discussion - especially between [MENTION=29398]Lanefan[/MENTION] and me - over the difference between a "static" situation, which reacts to player action declarations for their PCs, and a "GM puts the world into motion" situation. Some posters (eg [MENTION=16814]Ovinomancer[/MENTION], I thinik also [MENTION=23751]Maxperson[/MENTION]) seem to classify these both as sandboxes and see the salient difference only being whether the world is "boring" or "interesting because living/breathing".
Whereas I feel my discussion with [MENTION=29398]Lanefan[/MENTION] has brought out quite a different point of contrast, namely, the extent to which one tends to support a style of player-driven RPGing, whereas the other tends to put the GM into the driver's seat.
I recognise that others may not be interested in these matters, but - as the one who started the thread! - I regard them as worthwhile outcomes.
I'm not sure I get this: what is the connection betwee "illusionism" and players not wanting their PCs to die?