... Pretty sure Skittish is not a mechanic from Classic.
I know that the "muh Vanilla!"-crowd likes to claim ownership of everything running from sense of immersion to the invention of "challenge", but come on now.
If they'd use LEGION systems for M+ as optional modes on leveling coupled with world scaling however... Wooh-eh, that'd forever put the "Classic level is teh MLG-difficulty!!"-crowd forever in its place.
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Haha, indeed.