#21 - Aug. 1, 2011, 10:02 p.m.
You'll have access to all the systems by the end of Normal, but that doesn't mean you're going to scratch the surface with them.
You'll be leveling your artisans, teaching them to make new items, finding higher quality runes, finding higher quality gems, combining gems, finding loot in Nightmare that doesn't drop in Normal, finding loot in Hell that doesn't drop in Nightmare, etc. and really continuing to max out use of each of the available power adjustments.
Plus the need to really tighten up builds, get a good mix of skills, pick the right passives to support them, and gear out in specific directions becomes more and more important as the game gets tougher.
I don't think having to become a better player and invest more in all the game systems is a "deadzone", it's where the game gets challenging.